Fix params order in assertEqual

Fixed params order to correspond to real signature:
    assertEqual(expected, actual).

Change-Id: Icb8125843882221dbefcf5633aeb7a72544526cd
Partial-Bug: #1281052
Fix wrong exception raised by conductor for node

* Conductor should raise NodeInMaintenance exception while provisioning
  node which is under maintainence, same as the exception raised by the
  REST API

Change-Id: Ieab302fb96c7b1c11eaefc79621f0c635a16fefc
Closes-Bug: #1286410
Merge "Fix params order in assertEqual"