Restructure ProtoBuf & gRPC project structure

- pom.xml {protobuf, grpc}-dependencies to consolidte
  plugin configuration, dependency version property

- {protobuf, grpc}: ONOS App to load required feature/bundle

- all other atrifacts: Apps using protobuf/grpc inherit
  ~-dependencies above to reduce copy & paste configurations and
  dependency versions.

Change-Id: Ied90aff78ffddac6228d46e85e01d035eec37bee
diff --git a/incubator/grpc-dependencies/pom.xml b/incubator/grpc-dependencies/pom.xml
new file mode 100644
index 0000000..55bf19d
--- /dev/null
+++ b/incubator/grpc-dependencies/pom.xml
@@ -0,0 +1,188 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  ~ Copyright 2016-present Open Networking Laboratory
+  ~
+  ~ Licensed under the Apache License, Version 2.0 (the "License");
+  ~ you may not use this file except in compliance with the License.
+  ~ You may obtain a copy of the License at
+  ~
+  ~     http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing, software
+  ~ distributed under the License is distributed on an "AS IS" BASIS,
+  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  ~ See the License for the specific language governing permissions and
+  ~ limitations under the License.
+  -->
+
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <parent>
+        <artifactId>onos-incubator-protobuf-dependencies</artifactId>
+        <groupId>org.onosproject</groupId>
+        <version>1.9.0-SNAPSHOT</version>
+        <relativePath>../protobuf-dependencies/pom.xml</relativePath>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>onos-incubator-grpc-dependencies</artifactId>
+    <packaging>pom</packaging>
+
+    <properties>
+        <grpc.version>1.0.0</grpc.version>
+        <grpc.package.version>1.0.0</grpc.package.version>
+        <grpc.netty.version>4.1.3.Final</grpc.netty.version>
+        <grpc.netty.package.version>4.1.3</grpc.netty.package.version>
+        <google.auth.version>0.4.0</google.auth.version>
+    </properties>
+
+    <!-- gRPC requires more recent version of netty -->
+    <dependencyManagement>
+        <dependencies>
+            <dependency>
+                <groupId>io.grpc</groupId>
+                <artifactId>grpc-core</artifactId>
+                <version>${grpc.version}</version>
+            </dependency>
+
+            <dependency>
+                <groupId>io.grpc</groupId>
+                <artifactId>grpc-protobuf</artifactId>
+                <version>${grpc.version}</version>
+            </dependency>
+
+            <dependency>
+                <groupId>io.grpc</groupId>
+                <artifactId>grpc-stub</artifactId>
+                <version>${grpc.version}</version>
+            </dependency>
+
+            <dependency>
+                <groupId>io.grpc</groupId>
+                <artifactId>grpc-netty</artifactId>
+                <version>${grpc.version}</version>
+            </dependency>
+
+            <dependency>
+                <groupId>io.grpc</groupId>
+                <artifactId>grpc-auth</artifactId>
+                <version>${grpc.version}</version>
+            </dependency>
+
+            <dependency>
+                <groupId>io.netty</groupId>
+                <artifactId>netty-codec</artifactId>
+                <version>${grpc.netty.version}</version>
+            </dependency>
+
+            <dependency>
+                <groupId>io.netty</groupId>
+                <artifactId>netty-transport</artifactId>
+                <version>${grpc.netty.version}</version>
+            </dependency>
+
+            <dependency>
+                <groupId>io.netty</groupId>
+                <artifactId>netty-handler</artifactId>
+                <version>${grpc.netty.version}</version>
+            </dependency>
+
+            <dependency>
+                <groupId>io.netty</groupId>
+                <artifactId>netty-buffer</artifactId>
+                <version>${grpc.netty.version}</version>
+            </dependency>
+
+            <dependency>
+                <groupId>io.netty</groupId>
+                <artifactId>netty-common</artifactId>
+                <version>${grpc.netty.version}</version>
+            </dependency>
+
+        </dependencies>
+    </dependencyManagement>
+
+    <dependencies>
+
+        <dependency>
+            <groupId>io.grpc</groupId>
+            <artifactId>grpc-core</artifactId>
+        </dependency>
+
+        <dependency>
+            <groupId>io.grpc</groupId>
+            <artifactId>grpc-protobuf</artifactId>
+        </dependency>
+
+        <dependency>
+            <groupId>io.grpc</groupId>
+            <artifactId>grpc-stub</artifactId>
+        </dependency>
+
+        <dependency>
+            <groupId>io.grpc</groupId>
+            <artifactId>grpc-netty</artifactId>
+        </dependency>
+
+        <dependency>
+            <groupId>io.grpc</groupId>
+            <artifactId>grpc-auth</artifactId>
+        </dependency>
+
+    </dependencies>
+
+    <build>
+        <plugins>
+
+            <plugin>
+                <groupId>org.apache.felix</groupId>
+                <artifactId>maven-bundle-plugin</artifactId>
+                <extensions>true</extensions>
+            </plugin>
+
+        </plugins>
+
+        <pluginManagement>
+            <plugins>
+                <plugin>
+                    <groupId>org.xolstice.maven.plugins</groupId>
+                    <artifactId>protobuf-maven-plugin</artifactId>
+                    <version>0.5.0</version>
+                    <configuration>
+                        <pluginId>grpc-java</pluginId>
+                        <pluginArtifact>io.grpc:protoc-gen-grpc-java:${grpc.version}:exe:${os.detected.classifier}</pluginArtifact>
+                    </configuration>
+                    <executions>
+                        <execution>
+                            <goals>
+                                <goal>compile</goal>
+                                <goal>compile-custom</goal>
+                            </goals>
+                        </execution>
+                    </executions>
+                </plugin>
+                <plugin>
+                    <groupId>org.codehaus.mojo</groupId>
+                    <artifactId>build-helper-maven-plugin</artifactId>
+                    <executions>
+                        <execution>
+                            <id>add-source</id>
+                            <phase>generate-sources</phase>
+                            <goals>
+                                <goal>add-source</goal>
+                            </goals>
+                            <configuration>
+                                <sources combine.children="append">
+                                    <source>${project.build.directory}/generated-sources/protobuf/grpc-java</source>
+                                </sources>
+                            </configuration>
+                        </execution>
+                    </executions>
+                </plugin>
+            </plugins>
+        </pluginManagement>
+    </build>
+
+
+</project>