Primary-mongo node selection in simple mode added

* primary-mongo selection node added into simple mode serizlizer
* mongo nodes priority fixed: mongo, primary-mongo, controllers

Change-Id: I7769fa3e28d2f112a9ddcf9459dc878117ad3d34
Closes-Bug: 1311779
Closes-Bug: 1312637
Merge "Primary-mongo node selection in simple mode added"