Fixes Tempest XML test failures for Cisco N1kv plugin

Renamed N1kv_profile class to N1kv.
Modified N1kv attribute extension class to fix XML namespace issues.

Change-Id: I29b541730fc95c5e16667b64efd180be31e25b17
Closes-Bug: #1282352
NSX: Fix newly created port's status should be DOWN

Previously when creating a port in neutron using the nsx plugin
the port status returned would be ACTIVE even if this was not the
case. Now, DOWN is returned which will be updated by the backend
when the port goes ACTIVE.

Change-Id: I600fb1292ae79146cb14c7e23170262973878de0
Closes-bug: #1279551
Merge "Fixes Tempest XML test failures for Cisco N1kv plugin"
Merge "NSX: Fix newly created port's status should be DOWN"