No CSP for saltCommand function to fix hashmap serialization error

Change-Id: I5c637ca3deb61649ae963be0be5b963c4b7025d1
diff --git a/src/com/mirantis/mk/salt.groovy b/src/com/mirantis/mk/salt.groovy
index 30b2f16..2cf09d5 100644
--- a/src/com/mirantis/mk/salt.groovy
+++ b/src/com/mirantis/mk/salt.groovy
@@ -53,6 +53,7 @@
  * @param args     Additional arguments to function
  * @param kwargs   Additional key-value arguments to function
  */
+@NonCPS
 def runSaltCommand(master, client, target, function, args = null, kwargs = null) {
     def http = new com.mirantis.mk.http()