Set default TTL for memcache item expiration

Fixes: PROD-26960

Change-Id: I730c1e7248bfb81da36ec2fed924701490246db4
(cherry picked from commit e34392e21385e1156f2774225ff5bca23841b8bc)
diff --git a/tests/pillar/cluster.sls b/tests/pillar/cluster.sls
index 1290fc0..9d76228 100644
--- a/tests/pillar/cluster.sls
+++ b/tests/pillar/cluster.sls
@@ -46,6 +46,10 @@
       ha_queues: true
     cache:
       engine: memcached
+      expiration_time: 600
+      backend_argument:
+        memcached_expire_time:
+          value: 660
       members:
       - host: 127.0.0.1
         port: 11211