Add TaskManager lock on change port data

Updating port data may require driver actions on the related node
(if address changed for example). New method 'update_port' added
to conductor manager and rpcapi.

Partial-Bug: #1276393
Related-Bug: #1236714
Change-Id: I1f817a8b3c80630f40fd36c82e533d5358225150
Merge "Add TaskManager lock on change port data"