Set default TTL for memcache item expiration

Fixes: PROD-26960

Change-Id: I8880277c1c0fa3b6cbea1c26fcdf09d13b92a5e8
diff --git a/tests/pillar/compute_cluster_vmware.sls b/tests/pillar/compute_cluster_vmware.sls
index 8953178..80954dd 100644
--- a/tests/pillar/compute_cluster_vmware.sls
+++ b/tests/pillar/compute_cluster_vmware.sls
@@ -56,6 +56,10 @@
       password: metadata
     cache:
       engine: memcached
+      expiration_time: 600
+      backend_argument:
+        memcached_expire_time:
+          value: 660
       members:
       - host: 127.0.0.1
         port: 11211