Fix memcached host address.

Since pymemcache 3.4.0, localhost will first translate to ipv6 ([::1])
if possible instead of ipv4 (127.0.0.1). Since memcached is running in
the ipv4 interface, we need to point tooz to the right endpoint.

Conflicts:
  zuul.d/ironic-inspector-jobs.yaml

NOTE(moguimar): Conflicts are due small difference in adjacent lines.

Signed-off-by: Moisés Guimarães de Medeiros <moguimar@redhat.com>
Change-Id: Iddf558cd598e41ffead11e164ce2fb1720d15f34
(cherry picked from commit 86b974b75c)
(cherry picked from commit 965a4f5086)

devstack/plugin.sh

@@ -336,7 +336,7 @@ function configure_inspector {
     if [[ "$IRONIC_INSPECTOR_STANDALONE" == "False" ]]; then
       # memcached listens localhost instead of $SERVICE_HOST, which is exactly the default value,
       # but set explicitly in case that changed.
-      inspector_iniset coordination backend_url "memcached://localhost:11211"
+      inspector_iniset coordination backend_url "memcached://127.0.0.1:11211"
     fi
 
     if is_service_enabled swift; then

zuul.d/ironic-inspector-jobs.yaml

@@ -51,6 +51,7 @@
       devstack_localrc:
         IRONIC_DEFAULT_BOOT_OPTION: netboot
         IRONIC_INSPECTOR_STANDALONE: False
+        MEMCACHE_SERVERS: 127.0.0.1:11211
       devstack_services:
         s-account: True
         s-container: True