Enable keystone_authtoken/memcach_use_advanced_pool for Sahara

Sahara was removed during Wallaby cycle and because of that it was not
updated when commit 09bcacd25a was
backported from Wallaby to Victoria.
This change updates the Sahara templates to have consistent definition
with the other services.

Conflicts:
	deployment/sahara/sahara-base.yaml

Related-Bug: #1931047
Change-Id: Idb9a209b2651c1ff03c3ccaa14f4976a9f267e99
(cherry picked from commit 59599a86d7)
(cherry picked from commit 3b5628babc)

deployment/sahara/sahara-base.yaml

@@ -62,6 +62,11 @@ parameters:
     type: string
     default: 'regionOne'
     description: Keystone region for endpoint
+  MemcacheUseAdvancedPool:
+    type: boolean
+    description: |
+      Use the advanced (eventlet safe) memcached client pool.
+    default: true
 
 conditions:
   service_debug_unset: {equals : [{get_param: SaharaDebug}, '']}
@@ -104,3 +109,4 @@ outputs:
         sahara::keystone::authtoken::user_domain_name: 'Default'
         sahara::keystone::authtoken::project_domain_name: 'Default'
         sahara::keystone::authtoken::region_name: {get_param: KeystoneRegion}
+        sahara::keystone::authtoken::memcache_use_advanced_pool: {get_param: MemcacheUseAdvancedPool}