strip execution success from getFileContent

Change-Id: I2a6e926229bb1f0bd352faafe0347d8d2869c2f9
diff --git a/src/com/mirantis/mk/Salt.groovy b/src/com/mirantis/mk/Salt.groovy
index 644e8b4..71c17d6 100644
--- a/src/com/mirantis/mk/Salt.groovy
+++ b/src/com/mirantis/mk/Salt.groovy
@@ -614,7 +614,7 @@
 
 def getFileContent(master, target, file) {
     result = cmdRun(master, target, "cat ${file}")
-    return result['return'][0].values()[0]
+    return result['return'][0].values()[0].replaceAll('Salt command execution success','')
 }
 
 /**