Revert "use getFileContent as NonCPS"

This reverts commit e914f0e4f4fc5e9b15f208fdb98c64cbe0786108.

Change-Id: I5d7c632ee853e94e4735397b2286224b4cd7139a
diff --git a/src/com/mirantis/mk/Salt.groovy b/src/com/mirantis/mk/Salt.groovy
index e26c931..6180f99 100644
--- a/src/com/mirantis/mk/Salt.groovy
+++ b/src/com/mirantis/mk/Salt.groovy
@@ -398,7 +398,6 @@
  * @param file      File path to read (/etc/hosts for example)
  */
 
-@NonCPS
 def getFileContent(master, target, file) {
     result = cmdRun(master, target, "cat ${file}")
     return result['return'][0].values()[0]