Updated logging in salt.groovy

Change-Id: If020134ef0dd884a89f633831ae36ebcc11d643e
diff --git a/src/com/mirantis/mk/Common.groovy b/src/com/mirantis/mk/Common.groovy
index be9540b..a605b44 100644
--- a/src/com/mirantis/mk/Common.groovy
+++ b/src/com/mirantis/mk/Common.groovy
@@ -117,7 +117,7 @@
         debugEnabled = false
     }
     if(debugEnabled){
-        printMsg(msg, "red")
+        printMsg("[DEBUG] ${msg}", "red")
     }
 }