Fix manila-image-elements publish job

Although a publish job exists for manila-image-elements,
it doesn't upload anything because the filename it was
looking for was not created by the build. This patch
fixes the filename, and also renames tagged versions to
something different so they don't get overwritten.

Change-Id: Icea85a000cb68ae7befecadcca0ba7138fe7c7c2

jenkins/jobs/manila.yaml

@@ -185,6 +185,10 @@
       - shell: |
           #!/bin/bash -xe
           ./tools/gate/build-images {image-name}
+          BRANCH=$ZUUL_REFNAME
+          BRANCH_PATH=`echo $BRANCH | tr / -`
+          mkdir -p images
+          mv manila-service-image.qcow2 images/manila-service-image-$BRANCH_PATH.qcow2
 
     publishers:
       - scp: