Fix branch creation for releases based on tags

Jeremy Clinerequested to merge
fix-tag-check into os-build

The release scripts are supposed create a set of branches if the release is based of a tag rather than a snapshot. davidlt noted on IRC that branches were missing for recent tags, namely rc3 and rc4. The reason is that the check for a signed tag expects $UPSTREAM_REF to be the tag.

Resolve $UPSTREAM_REF to a tag (if it exists) prior to verifying the tag.

Signed-off-by: Jeremy Cline jcline@redhat.com

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