Added minimal Share Migration support to generic driver,
so the Generic Migration procedure can work.
The approach to support is to add a field to Share Server
backend_details named service_ip with the port IP address that
allows the controller to access the Share Servers (same IP address
which they SSH through), this IP is used to return the access rule
required for the generic migration procedure.
For "driver_handles_share_servers=False" mode, configuration falls
back to common implementation in Core code and its parameters.
Optimized migration for Generic Driver will be included
as a separate patch.
Change-Id: Ie7d19a44c9ab05c5a6a79c30478be23b2e8a3ba2
Implements: blueprint share-migration
f5add61a8d