Do not raise error in case of initial health-check failure

An error should not be raised in initial contrail services health-check
before restore, as a main use case for Cassandra DB restore pipeline
is to fix broken environment by rolling back to "working" DB snapshot.

Change-Id: I5568fbb9c2c2747e91d7eeadeba5506425084756
Related-PROD: PROD-32492
diff --git a/restore-cassandra.groovy b/restore-cassandra.groovy
index fb1259f..76b64ae 100644
--- a/restore-cassandra.groovy
+++ b/restore-cassandra.groovy
@@ -32,8 +32,7 @@
             try {
                 salt.enforceState(pepperEnv, 'I@opencontrail:control or I@opencontrail:collector', 'opencontrail.upgrade.verify', true, true)
             } catch (Exception er) {
-                common.errorMsg("Opencontrail controllers health check stage found issues with services. Please take a look at the logs above.")
-                throw er
+                common.errorMsg("Opencontrail controllers health check stage found issues with currently running services.")
             }
         }