This patch is based on https://review.openstack.org/161194
It renames vmware_nsx/tests/unit/vmware/ to vmware_nsx/tests/unit/
and creates subdirectories
vmware_nsx/tests/unit/dvs/
vmware_nsx/tests/unit/nsx_mh/
vmware_nsx/tests/unit/nsx_v/
vmware_nsx/tests/unit/nsx_v3/
vmware_nsx/tests/unit/nsxlib/mh/
vmware_nsx/tests/unit/nsxlib/v3/
This is part of new vmware_nsx directory structure proposed in
https://goo.gl/GdWXyH.
Change-Id: I16aa2455bce55f6455bb5e504ee9684c675b4257