Build with Java8 Mvn plugins for Gerrit v2.14/v2.15

Change-Id: I49f8b535d1ed0bcb4d1a5088db366d473c0f9229
diff --git a/jenkins/gerrit-mvn-build-plugin.sh b/jenkins/gerrit-mvn-build-plugin.sh
index d6c6e0c..fd9e54f 100644
--- a/jenkins/gerrit-mvn-build-plugin.sh
+++ b/jenkins/gerrit-mvn-build-plugin.sh
@@ -1,7 +1,7 @@
 #!/bin/bash -e
 
 
-if [ "{branch}" == "master" ]
+if [ "{branch}" == "master" ] || [ "{branch}" == "stable-2.15" ] || [ "{branch}" == "stable-2.14" ]
 then
   git read-tree -u --prefix=gerrit gerrit/{branch}
   . set-java.sh 8