Fix VCP images creation

Do not change VCP disk profile globally, it causes to re-use
the properties from one node in another.

Change-Id: Iff98010c32c1060b50bc0ae040edb72108c57da1

_modules/virtng.py

 
 # Import python libs
 from __future__ import absolute_import
+import copy
 import os
 import re
 import sys
     else:
         overlay = {}
 
-    disklist = __salt__['config.get']('virt:disk', {}).get(profile, default)
+    disklist = copy.deepcopy(__salt__['config.get']('virt:disk', {}).get(profile, default))
     for key, val in overlay.items():
         for i, disks in enumerate(disklist):
             for disk in disks: