Enable tempest tests for hostname sanitization

Starting Wallaby release, nova sanitizes instance hostnames having
freeform characters with dashes. It should be tested in Devstack.

Depends-On: https://review.opendev.org/c/openstack/tempest/+/795699
Change-Id: I54794e58b67620c36e8f2966ec3b62dd24da745b
diff --git a/lib/tempest b/lib/tempest
index 4eacfa0..095361d 100644
--- a/lib/tempest
+++ b/lib/tempest
@@ -419,6 +419,9 @@
     iniset $TEMPEST_CONFIG compute-feature-enabled live_migrate_back_and_forth ${LIVE_MIGRATE_BACK_AND_FORTH:-False}
     iniset $TEMPEST_CONFIG compute-feature-enabled attach_encrypted_volume ${ATTACH_ENCRYPTED_VOLUME_AVAILABLE:-True}
 
+    # Starting Wallaby, nova sanitizes instance hostnames having freeform characters with dashes
+    iniset $TEMPEST_CONFIG compute-feature-enabled hostname_fqdn_sanitization True
+
     if [[ -n "$NOVA_FILTERS" ]]; then
         iniset $TEMPEST_CONFIG compute-feature-enabled scheduler_enabled_filters ${NOVA_FILTERS}
     fi