Updating onos-maven-plugin version to 1.8-SNAPSHOT

Change-Id: Ic3851ac99960acf7264540a6b9aecffd485aca80
diff --git a/tools/package/maven-plugin/pom.xml b/tools/package/maven-plugin/pom.xml
index 46d9945..e8f1b9e 100644
--- a/tools/package/maven-plugin/pom.xml
+++ b/tools/package/maven-plugin/pom.xml
@@ -25,7 +25,7 @@
 
     <groupId>org.onosproject</groupId>
     <artifactId>onos-maven-plugin</artifactId>
-    <version>1.7</version>
+    <version>1.8-SNAPSHOT</version>
     <packaging>maven-plugin</packaging>
 
     <description>Maven plugin for packaging ONOS applications or generating