Configure watcher tempest's microversion in devstack

Adds a tempest configuration for min and max microversions supported
by watcher. This help us to define the correct range of microversion
to be tested on each stable branch.
New microversion proposals should also increase the default
max_microversion, in order to work with watcher-tempest-plugin
microversion testing.

Change-Id: I0b695ba4530eb89ed17b3935b87e938cadec84cc
(cherry picked from commit adfe3858aa)
Signed-off-by: Douglas Viroel <viroel@gmail.com>

devstack/lib/watcher

@@ -267,6 +267,19 @@ function stop_watcher {
     done
 }
 
+# configure_tempest_for_watcher() - Configure Tempest for watcher
+function configure_tempest_for_watcher {
+    # Set default microversion for watcher-tempest-plugin
+    # Please make sure to update this when the microversion is updated, otherwise
+    # new tests may be skipped.
+    TEMPEST_WATCHER_MIN_MICROVERSION=${TEMPEST_WATCHER_MIN_MICROVERSION:-"1.0"}
+    TEMPEST_WATCHER_MAX_MICROVERSION=${TEMPEST_WATCHER_MAX_MICROVERSION:-"1.4"}
+
+    # Set microversion options in tempest.conf
+    iniset $TEMPEST_CONFIG optimize min_microversion $TEMPEST_WATCHER_MIN_MICROVERSION
+    iniset $TEMPEST_CONFIG optimize max_microversion $TEMPEST_WATCHER_MAX_MICROVERSION
+}
+
 # Restore xtrace
 $_XTRACE_WATCHER
 

devstack/plugin.sh

@@ -36,6 +36,9 @@ if is_service_enabled watcher-api watcher-decision-engine watcher-applier; then
         # Start the watcher components
         echo_summary "Starting watcher"
         start_watcher
+    elif [[ "$1" == "stack" && "$2" == "test-config" ]]; then
+        echo_summary "Configuring tempest for watcher"
+        configure_tempest_for_watcher
     fi
 
     if [[ "$1" == "unstack" ]]; then