Fix cinder test cases when cinder extensions are in use

When cinder extension like extended_snapshot_attributes or volume_mig_status_attribute
are used this laters add extra attributes to response of queries 'show' and 'detail' but
not 'list', which mean the return response from 'show' and 'list' will not be identical,
so we should only compare result from 'list' and 'show' of specific attribute e.g.
id, display_name ... .

Closes-Bug: #1245377
Change-Id: I52fd9cf7cb2e67c04f575bfeb00e66660e00947d
Merge "Fix cinder test cases when cinder extensions are in use"