Fix propose_update REFNAME handling
With v2 we had "master", now it's "refs/heads/master", remove the
refs/heads from ZUUL_REFNAME so that the script continues to work.
@@ -99,6 +99,8 @@ if [ -z "$ZUUL_REFNAME" ] ; then
fi
ZUUL_REFNAME=$BRANCH_NAME
fi
+# Zuul v3 adds refs/heads, remove that to get the branch
+ZUUL_REFNAME=${ZUUL_REFNAME#refs/heads/}
setup_git
