Increase retries for Glance api checks

Sometimes glance backend need more time to become available
under haproxy.

Change-Id: Ia6579e87d793015261a50ac5367360dcbc94634f
diff --git a/src/com/mirantis/mk/Orchestrate.groovy b/src/com/mirantis/mk/Orchestrate.groovy
index 806be8a..9ea8469 100644
--- a/src/com/mirantis/mk/Orchestrate.groovy
+++ b/src/com/mirantis/mk/Orchestrate.groovy
@@ -315,7 +315,7 @@
 
     // Check glance service
     if (salt.testTarget(master, "I@glance:server ${extra_tgt}")) {
-        common.retry(3,5){
+        common.retry(10,5){
             salt.cmdRun(master, "I@keystone:server ${extra_tgt}", '. /root/keystonercv3; glance image-list')
         }
     }