Contrail/havana probe create issue

This pull request fixes the two bugs - https://bugs.launchpad.net/opencontrail/+bug/1311602
1. When create_port is called and if 'device_id' is not a valid uuid value, there is an exception 
2. If 'fixed_ips' doesn't have 'ip_address' key, there is KeyError exception

Thanks
Numan