Fail main maven build if java maven build fails
Fail main maven build if java maven build fails

Java maven sub build could fail and main maven build still
succeed because of the shell script in between. Pass the maven
exit code back

Change-Id: I4df4ee7d782db21c89c49b0ee0a4741cbfa97edb

stackforge/monasca-common,openstack/monasca-common,stackforge/monasca-common,openstack/monasca-common,stackforge/monasca-common,openstack/monasca-common