Pass more options to salt.getFileContent

sometimes there's a need to have more control over cmdRun that is
exectuted inside this method.

Change-Id: I2bcc927569a61ff837ab0eb4a2accb5448b01f13
diff --git a/src/com/mirantis/mk/Salt.groovy b/src/com/mirantis/mk/Salt.groovy
index 2273ebd..ca209be 100644
--- a/src/com/mirantis/mk/Salt.groovy
+++ b/src/com/mirantis/mk/Salt.groovy
@@ -1004,8 +1004,8 @@
  * @param file      File path to read (/etc/hosts for example)
  */
 
-def getFileContent(saltId, target, file) {
-    result = cmdRun(saltId, target, "cat ${file}")
+def getFileContent(saltId, target, file, checkResponse = true, batch=null, output = true, saltArgs = []) {
+    result = cmdRun(saltId, target, "cat ${file}", checkResponse, batch, output, saltArgs)
     return result['return'][0].values()[0].replaceAll('Salt command execution success','')
 }