Update pom.xml to depend on official onos-dependencies parent pom

This patch fixes the issues seen when trying to release the app,
and in general, when trying to execute maven stages other than
build/install.

ONOS stopped publishing onos-dependencies with version 2.2.0, thus
requiring each app to explicitly declare dependencies and plugins. The
following ONOS patch revamps support for building 3rd-party apps with
Maven, including publishing of the onos-dependencies (parent) pom:
https://gerrit.onosproject.org/#/c/22790/

The new onos-dependencies exposes shared Java dependencies as well as
Maven plugins, already configured to support the whole life-cycle of
apps (from build, to reporting and release).

Change-Id: Ia127861651b65bbf67e70375fb48317edab5ade8
diff --git a/pom.xml b/pom.xml
index 29176fb..92df763 100644
--- a/pom.xml
+++ b/pom.xml
@@ -19,15 +19,18 @@
          xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
 
+    <parent>
+        <groupId>org.onosproject</groupId>
+        <artifactId>onos-dependencies</artifactId>
+        <version>2.2.1-b2</version>
+    </parent>
+
     <groupId>org.opencord</groupId>
     <artifactId>olt</artifactId>
     <version>4.0.0-SNAPSHOT</version>
     <packaging>pom</packaging>
 
     <properties>
-        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-        <onos.version>2.2.0</onos.version>
-        <karaf.version>4.2.6</karaf.version>
         <sadis.api.version>4.0.0-SNAPSHOT</sadis.api.version>
     </properties>
 
@@ -51,13 +54,6 @@
             <scope>provided</scope>
         </dependency>
 
-        <dependency>
-            <groupId>com.google.guava</groupId>
-            <artifactId>guava</artifactId>
-            <version>22.0</version>
-            <scope>provided</scope>
-        </dependency>
-
     </dependencies>
 
     <repositories>
@@ -87,27 +83,6 @@
         </repository>
     </repositories>
 
-    <build>
-        <plugins>
-            <plugin>
-                <groupId>org.apache.felix</groupId>
-                <artifactId>maven-bundle-plugin</artifactId>
-                <version>4.1.0</version>
-                <extensions>true</extensions>
-                <inherited>true</inherited>
-            </plugin>
-
-            <plugin>
-                <groupId>org.apache.maven.plugins</groupId>
-                <artifactId>maven-compiler-plugin</artifactId>
-                <version>3.8.0</version>
-                <configuration>
-                    <release>11</release>
-                </configuration>
-                <inherited>true</inherited>
-            </plugin>
-        </plugins>
-    </build>
     <distributionManagement>
         <snapshotRepository>
             <id>ossrh</id>