Improve Puppet Openstack module detection in build_srpm.sh
Improve Puppet Openstack module detection in build_srpm.sh

Previously, we were detecting Puppet OpenStack modules in build_srpm.sh
by checking at the Source0 line from the spec. This may be unreliable
and depends on how specs are built.

Let's change that by detecting if the module name in metadata.json
starts by openstack-, as all Puppet OpenStack modules do.

Change-Id: I708beb9f625dd67de043cb04e7a94eaf8d6c6f5f

openstack-packages/DLRN,openstack-packages/DLRN,openstack-packages/delorean,openstack-packages/delorean