Fix volume info display error on create with v2.

Error due to popping 'links' when it does not exist.

Change-Id: I3f25b97f16699373ef12d9ac47905900b4b631f8
Fixes: bug 1190853
Use exceptions from oslo

These exceptions can be used in novaclient, keystoneclient,
glanceclient, and other client projects.

Partially implements: blueprint common-client-library

Change-Id: I43918316622b1c1d722872fe30199db6a3a7bb76
Merge "Use exceptions from oslo"