Remove call to super in the NvpPluginV2.__init__ method

DHC-2385

Change-Id: I05528ac9f728345ea580551f1c6d473c41b62e97
Signed-off-by: Rosario Di Somma <rosario.disomma@dreamhost.com>
Merge pull request #39 from rodis/fix/dhc-2358-stop-syncing-routers

Remove call to super in the NvpPluginV2.__init__ method