Add API version command

* 'api show' displays various bits about the API versions available in
  the client and on the servers.

Change-Id: I02452f62ee0cd698594bbcf90c0654234d86257a
Fix --password in server rebuild

Use correct attribute to get password in server rebuild command.

Fixes bug 1190722

Change-Id: Ibe2ccb8840a385319781885b8aadca6e1ba4cc43
Merge branch 'rebuild-password' into dt-test
Merge branch 'api-list' into dt-test
Merge branch 'volume-keystone' into dt-test