Do not create db backup in Cassandra restore pipeline

Cassandra restore pipeline should not perform any backups before
restore procedure, it's purpose only restore steps. If backup is
needed, separate steps/pipeline can be used.

Change-Id: I916c3053db82f5e3b3e69c3883af584decec10a0
Related-PROD: PROD-31351
diff --git a/restore-cassandra.groovy b/restore-cassandra.groovy
index b80f8ae..bdcf2cd 100644
--- a/restore-cassandra.groovy
+++ b/restore-cassandra.groovy
@@ -37,10 +37,6 @@
             }
         }
 
-        stage('Backup') {
-            salt.cmdRun(pepperEnv, 'I@cassandra:backup:client', 'bash /usr/local/bin/cassandra-backup-runner-call.sh')
-        }
-
         stage('Restore') {
             // get opencontrail version
             def contrailVersion = getValueForPillarKey(pepperEnv, "I@opencontrail:control:role:primary", "_param:opencontrail_version")
@@ -67,13 +63,13 @@
                     common.errorMsg('An error has been occurred during cassandra db startup: ' + err.getMessage())
                     throw err
                 }
-                // remove restore-already-happenned file if any is present
+                // remove restore-already-happened file if any is present
                 try {
                     salt.cmdRun(pepperEnv, 'I@cassandra:backup:client', 'rm /var/backups/cassandra/dbrestored')
                 } catch (Exception err) {
                     common.warningMsg('/var/backups/cassandra/dbrestored not present? ' + err.getMessage())
                 }
-                // perform actual backup
+                // perform restore steps
                 salt.enforceState(pepperEnv, 'I@cassandra:backup:client', "cassandra")
                 salt.runSaltProcessStep(pepperEnv, 'I@cassandra:backup:client', 'system.reboot', null, [], true, 5)
                 sleep(5)