Remove currentBuild.result 'FAILURE', because it can not be unset later

Change-Id: I464bebd4a7895f8b46709fe83b885320aa6361a0
(cherry picked from commit 9b63be45c75fb1df2b4d3cbc50f2c3f51f497b3a)
diff --git a/src/com/mirantis/mk/Common.groovy b/src/com/mirantis/mk/Common.groovy
index a4b9637..4922505 100644
--- a/src/com/mirantis/mk/Common.groovy
+++ b/src/com/mirantis/mk/Common.groovy
@@ -542,7 +542,6 @@
             sleep(delay)
         }
     }
-    currentBuild.result = "FAILURE"
     throw new Exception("Failed after $times retries")
 }