Modified vnc_api constructor to accept more arguments for auth settings.
Now caller can pass on auth server parameter, lib will use if caller has given,
otherwise will try to read vnc_api_lib.ini and use, otherwise will use
its default value.
Modified provision_vrouter.py to pass openstack-ip for auth during vrouter setup.

Change-Id: Ibaac8226ad6d537a29de6a8f9fece3fd11a16ad4
Merge "Modified vnc_api constructor to accept more arguments for auth settings. Now caller can pass on auth server parameter, lib will use if caller has given, otherwise will try to read vnc_api_lib.ini and use, otherwise will use its default value. Modified provision_vrouter.py to pass openstack-ip for auth during vrouter setup." into R1.10