Do not update repos after snapshot revert

In the cloud-update pipleine, a VM snapshot is taken at the very
beginning of the update process, before anything gets executed on
the nodes. Therefore, when a snapshot is reverted, there is no need
to run any states after that - the node is already in the original state.

Change-Id: I68266c170755c788b80976d80433937aa80dc2d6
Closes-Bug: PROD-22198
diff --git a/cloud-update.groovy b/cloud-update.groovy
index d58d1e0..9fdeaad 100644
--- a/cloud-update.groovy
+++ b/cloud-update.groovy
@@ -573,14 +573,12 @@
     }
     try {
         salt.minionsReachable(pepperEnv, 'I@salt:master', tgt)
-        // purge and setup previous repos
-        salt.enforceState(pepperEnv, tgt, 'linux.system.repo')
     } catch (Exception e) {
         common.errorMsg(e)
         if (INTERACTIVE.toBoolean()) {
-            input message: "Salt state linux.system.repo on ${tgt} failed. Do you want to PROCEED?."
+            input message: "Not all minions ${tgt} returned after snapshot revert. Do you want to PROCEED?."
         } else {
-            throw new Exception("Salt state linux.system.repo on ${tgt} failed")
+            throw new Exception("Not all minions ${tgt} returned after snapshot revert")
         }
     }
 }