Refactor role list subcommand for identity v3 api

Currently parts of user list and group list command are actually
functioning as role listing, which is quite counter intuitive and
misleading.

This refactor change move role related logic to a single place of role
list command. It now allows role grants listing for user/group +
domain/project combinations.

If no user or group specified, it will list all roles in the system,
which is the default behaviour.

Change-Id: I4ced6df4b76f018d01000d28b4281ad9f252ffcc
Change the token verb to issue/revoke

Change the token verb to issue/revoke as documented in:

https://wiki.openstack.org/wiki/OpenStackClient/Commands#token
https://wiki.openstack.org/wiki/OpenStackClient/Commands#Actions

Change-Id: I44f77f98ad3269c4f2149301c204804dcb75ac81
Merge "Change the token verb to issue/revoke"
Merge "Refactor role list subcommand for identity v3 api"