Add name arguments to keystone command.

This patch adds name arguments to the following subcommands:
  * role-delete
  * role-get
  * service-delete
  * service-get
  * tenant-delete
  * tenant-get
  * tenant-update
  * user-delete
  * user-get
  * user-password-update
  * user-role-add
  * user-role-list
  * user-role-remove
  * user-update

Fixes bug 1100648

Change-Id: I73c08c0ba553a72ec57ff3a684a00be4ef1294a6
Merge "Add name arguments to keystone command."