Add job variable for Ci verbosity

sometime need to run CI job with more verbosity for investigation,
define variable 'quickstart_verbosity' in job definition for that.
Passing it like:

- tripleo-ci-centos-8-standalone:
    vars:
      quickstart_verbosity: -vvvv


Change-Id: Ia7160fec24d7f4c31063d6a0487b1120e2b7c504

roles/run-test/templates/toci_quickstart.sh.j2

@@ -137,7 +137,7 @@ for playbook in {{ " ".join(playbooks) }}; do
         {{ env_vars }} \
         {{ role_vars }} \
         {{ extra_vars }} \
-        {{ vxlan_vars }} \
+        {{ vxlan_vars }} {{ quickstart_verbosity|default('') }} \
         $DEFAULT_ARGS \
         $LOCAL_WORKING_DIR/playbooks/$playbook ${PLAYBOOKS_ARGS[$playbook]:-}" \
         --extra-vars @{{ workspace }}/logs/zuul-variables.yaml \
@@ -163,7 +163,7 @@ done
             {{ env_vars }} \
             {{ role_vars }} \
             {{ extra_vars }} \
-            {{ vxlan_vars }} \
+            {{ vxlan_vars }} {{ quickstart_verbosity|default('') }} \
             $DEFAULT_ARGS \
             --extra-vars @{{ workspace }}/logs/zuul-variables.yaml \
             --extra-vars @{{ workspace }}/logs/hostvars-variables.yaml \