Fix startup dependency between features onos-app-config and onos-app-sdnip:
 * Expose NetworkConfigReader as a service - NetworkConfigService
 * Add reference within SdnIp to NetworkConfigService

This fixes bug ONOS-735

Change-Id: I85cdd0ce0a4f6293e8a5633bddd140a23ecddc10
diff --git a/apps/sdnip/pom.xml b/apps/sdnip/pom.xml
index 09a3a48..920b5e5 100644
--- a/apps/sdnip/pom.xml
+++ b/apps/sdnip/pom.xml
@@ -96,6 +96,12 @@
     </dependency>
 
     <dependency>
+      <groupId>org.onosproject</groupId>
+      <artifactId>onos-app-config</artifactId>
+      <version>${project.version}</version>
+    </dependency>
+
+    <dependency>
       <groupId>org.apache.karaf.shell</groupId>
       <artifactId>org.apache.karaf.shell.console</artifactId>
     </dependency>