[python-contrail] Add vnc_api_lib.ini config.

Refs: https://review.opencontrail.org/#/c/194/
      https://review.opencontrail.org/#/c/195/
      https://bugs.launchpad.net/opencontrail/+bug/1319851
Merge pull request #102 from sbadia/vnc-api-conf

[python-contrail] Add vnc_api_lib.ini config.