Add share server id field in shares detail info

Each share in manila keeps information about share
server where this share is situated. For now shares
can be filtered using this id only by admin. But share
server id is not shown in response even to admins.

Change-Id: Iea87805b999681f41b091dc114d52244480bb488
Closes-Bug: #1379378
Merge "Add share server id field in shares detail info"