Bumping onos-maven-plugin to 2.2-SNAPSHOT.

Change-Id: I32dcc2ab8367989d36655fa9071aee3b0ff228d8
diff --git a/tools/package/maven-plugin/pom.xml b/tools/package/maven-plugin/pom.xml
index 82a688f..e4f96ac 100644
--- a/tools/package/maven-plugin/pom.xml
+++ b/tools/package/maven-plugin/pom.xml
@@ -26,7 +26,7 @@
 
     <groupId>org.onosproject</groupId>
     <artifactId>onos-maven-plugin</artifactId>
-    <version>2.1</version>
+    <version>2.2-SNAPSHOT</version>
     <packaging>maven-plugin</packaging>
 
     <description>Maven plugin for packaging ONOS applications or generating