Remove "" in return sting when getting stack ip when needed

Different heatclient version return output in "" and without "".
This patch allows to get stack IP for any heatclient version by
replacing '"' if it is found in string.
In future migrate to 'openstack stack output show' when all
jobs using heatlient mitaka and later.

Change-Id: Ic01b2fbf206c00e93701a80313ea6c2c81e0958d
diff --git a/src/com/mirantis/mk/Openstack.groovy b/src/com/mirantis/mk/Openstack.groovy
index b261f03..6d38a31 100644
--- a/src/com/mirantis/mk/Openstack.groovy
+++ b/src/com/mirantis/mk/Openstack.groovy
@@ -267,7 +267,10 @@
     cmd = "heat output-show ${name} ${outputParam}"
     output = runOpenstackCommand(cmd, env, path)
     echo("${cmd}: ${output}")
-    return "${output}".substring(1, output.length()-1)
+    // NOTE(vsaienko) heatclient 1.5.1 returns output in "", while later
+    // versions returns string without "".
+    // TODO Use openstack 'stack output show' when all jobs using at least Mitaka heatclient
+    return "${output}".replaceAll('"', '')
 }
 
 /**