Refactor: move telemetry config from componentCfg to configs.xml

1. Support to export the metrics to multiple targets
2. Add a set of properties to kafka config (key, topic, etc.)
3. Add distributedStore to manage telemetry configs
4. Add CLI to query stored telemetry configs
5. Add a set of telemetry loaders to import xml definitions
6. Add unit tests for telemetry cfg, xml cfg loader and dist store
7. Add missing javadoc for a set of implementation classes

Change-Id: I39480c9a6ac07357184d2e1094b9c9f4d36fd8b1
diff --git a/apps/openstacktelemetry/app/src/main/resources/org/onosproject/openstacktelemetry/impl/influxdb-configs.xml b/apps/openstacktelemetry/app/src/main/resources/org/onosproject/openstacktelemetry/impl/influxdb-configs.xml
new file mode 100644
index 0000000..d702a44
--- /dev/null
+++ b/apps/openstacktelemetry/app/src/main/resources/org/onosproject/openstacktelemetry/impl/influxdb-configs.xml
@@ -0,0 +1,30 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  ~ Copyright 2018-present Open Networking Foundation
+  ~
+  ~ 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.
+  -->
+<configs>
+    <config name="influxdb" type="influxdb" manufacturer="influxdata.com" swVersion="master">
+        <property name="address">127.0.0.1</property>
+        <property name="port">8086</property>
+        <property name="username">onos</property>
+        <property name="password">onos</property>
+    </config>
+    <config name="sona-influxdb-connector" manufacturer="SK Telecom"
+            swVersion="1.0" extends="influxdb" enabled="false">
+        <property name="database">ost</property>
+        <property name="measurement">sonaflow</property>
+        <property name="enableBatch">true</property>
+    </config>
+</configs>
\ No newline at end of file