Updated generic_driver and service_instance with activation

Generic driver changes to activation/deactivation of
share_networks requires changes to service instance.
Also it requires changes to tempest plugin, that should
use activation of share networks before creation of shares.

Partially-implements bp share-network-activation-api
Closes-Bug: #1294577
Closes-Bug: #1273758

Change-Id: Ide3b9a51038b532bee464e256f6e830fb93001f7
Merge "Updated generic_driver and service_instance with activation"