Add support for network name for os::nova::Server

Property 'network' is added to networks schema of the resource
os::nova::Server. It takes uuid or name. The 'uuid' property is deprecated.

Change-Id: I790bd23301ecfb7b8aa22f6c42b9e6c01cd0b186
Closes-Bug: #1247019
Merge "Add support for network name for os::nova::Server"