Add --or-show support for v3 identity resources

Add --or-show for the following:
  * v3 roles
  * v3 projects
  * v3 domains
  * v3 users
  * v3 groups

Closes-Bug: #1390389
Change-Id: Id4ef043e5fda6be49a515eb3fe138c813c393ec9
Merge "Add --or-show support for v3 identity resources"