This patch will create:
vmware_nsx/plugins/dvs for DVS specific files
vmware_nsx/plugins/nsx_mh for MH specific files
vmware_nsx/plugins/nsx_v for nsx_v specific files
vmware_nsx/plugins/nsx_v3 for nsx_v3 specific files
also move vmware_nsx/vsphere/ to vmware_nsx/plugins/nsx_v/vsphere/.
This is part of new vmware_nsx directory structure proposed in
https://goo.gl/GdWXyH.
Change-Id: I00ee12da2eea0add988bae3d4f3e12940ea829bb