Wmiv2 commit 2

Hyper-V WMI V2 Adaptation. 
Network binding and snapshoting added to vmutilsv2. 
networkutilsv2 now gets correct external_vswitch. Creating vswitch port no longer necesarry, only the vswitch path is. 
vhdutilsv2 methods are now do what they are supposed to. 
vif and snapshotops classes now use the factory methods for getting the needed utils.