SM-Storage: exit with error after mount to allow next puppet run

by exiting with error after mount, puppet will be run one more time  and
this run will ensure ownership of /var/lib/nova/instances/global is correct

closes-bug: #1421534

Unit testing:
1. Created multi node cluster with storage
  a. Verified installation was successful
  b. LiveVM came up, shared space is mount correctly
  c. Ownership of shared space is nova:nova
  d. Created, attached to disk, and migrated a VM to different host

Change-Id: Ib4980ac3252106b5473b9a692a4a94ee2399223b

contrail/environment/modules/contrail/files/config-storage-lm-compute.sh

@@ -182,13 +182,21 @@ RETVAL=$?
 if [ $RETVAL -eq 0 ]
 then 
   echo "ping done"
+  stat -c '%U:%G'  /var/lib/nova/instances/global
+  STAT_OUTPUT=`stat -c '%U:%G'  /var/lib/nova/instances/global`
+  echo "current ownership of instances : ${STAT_OUTPUT}"
   mount 192.168.101.3:/livemnfsvol /var/lib/nova/instances/global
   RETVAL=$?
   if [ ${RETVAL} -ne 0 ]
   then
     echo "mount to livemnfsvol failed"
     exit ${RETVAL}
   fi
+  echo "exiting with failed status to give chown one more chance"
+  stat -c '%U:%G'  /var/lib/nova/instances/global
+  STAT_OUTPUT=`stat -c '%U:%G'  /var/lib/nova/instances/global`
+  echo "current ownership of instances : ${STAT_OUTPUT}"
+  exit 1
 else
   echo "ping to livemnfs failed"
    exit 1