related to bug: PROD-20139

Change-Id: I32fee91f22e0963ec60de63b4c6e020df92f9f3b

Change-Id: I28bbc7a6b5810dfb56b8391a557aecd1fa523385

[Fix] Doc

Issue: - It is not possible to pass [R]andom [N]umber [G]enerator
         device to libvirt guest xml in order to control entropy.

       - Doc has no information on how to provision vms using salt

Solution: - Pass rng parameters via kwargs from node: pillar
            Attach rng xml object to generated xml.

          - Provide with an example

Prod-Related: PROD-19214
Customer-Found
Change-Id: Iea111f2d927edf46f06bb7ccfad06d37b752fba9

Change-Id: I685de4207f1f7f17264cc4ad2d81c3348ca20074

Change-Id: I6f1292779858c45f9cf6f4caf3657ee000b2cf06

Add ability to specify custom node name in reclass.

Change-Id: I26aeae62cc1c1d407d36d1d6bf101db073d9e610