fix restGet in Salt

Change-Id: I03179ddd77a6c74b581fc179e7c9d0a1c95047e9
diff --git a/src/com/mirantis/mk/Salt.groovy b/src/com/mirantis/mk/Salt.groovy
index 8ec2979..021a3e5 100644
--- a/src/com/mirantis/mk/Salt.groovy
+++ b/src/com/mirantis/mk/Salt.groovy
@@ -30,12 +30,13 @@
  * @param master   Salt connection object
  */
 def saltLogin(master) {
+    def http = new com.mirantis.mk.Http()
     data = [
         'username': master.creds.username,
         'password': master.creds.password.toString(),
         'eauth': 'pam'
     ]
-    authToken = restGet(master, '/login', data)['return'][0]['token']
+    authToken = http.restGet(master, '/login', data)['return'][0]['token']
     return authToken
 }