[tool] Skip tempest plugins when listing unreleased and open changes

tools/list_unreleased_and_open_changes.sh script is used before stable
branches transition to Unmaintained or EOL to support final stable
releases of deliverables. Tempest plugins are branchless, so we don't
need them to be listed.

Change-Id: I98ecb19d7293a265426e582a0f3bbfb673a083f4

tools/list_unreleased_and_open_changes.sh

@@ -52,7 +52,8 @@ for team in ${OPENSTACK_TEAMS}; do
     echo "Checking repositories of team: ${team}"
 
     REPOS=$(list-deliverables --repos \
-            --series ${SERIES} --team ${team} | grep "^openstack/")
+            --series ${SERIES} --team ${team} \
+            --except-type tempest-plugin | grep "^openstack/")
 
     if [ -n "${REPOS}" ]; then
         echo "List of open and unreleased changes of team '${team}' " \