Added parseJSON function to common

Change-Id: I55fff0d2e9aa6cd5d504e4ce9bb9f90949d23b98
diff --git a/src/com/mirantis/mk/Common.groovy b/src/com/mirantis/mk/Common.groovy
index fe82185..8da0f3e 100644
--- a/src/com/mirantis/mk/Common.groovy
+++ b/src/com/mirantis/mk/Common.groovy
@@ -396,3 +396,15 @@
         return false
     }
 }
+
+/**
+ * Parse JSON string to hashmap
+ * @param jsonString input JSON string
+ * @return created hashmap
+ */
+def parseJSON(jsonString){
+   def m = [:]
+   def lazyMap = new JsonSlurper().parseText(output)
+   m.putAll(lazyMap)
+   return m
+}