This is a followup to https://review.openstack.org/#/c/541609/ that
changes most outstanding direct uses of sys.stdout to use the encoded
stdout set up by cliff.

Change-Id: I07cfc418385fc787d3b7d3c32d39676cf81bb91f

Implements the commands for endpoint group filter management.
Includes the CRUD management of the endpoint groups and the
association management between them and the projects that are
using this method.

Implements: blueprint keystone-endpoint-filter
Change-Id: I4265f7f8598d028191e90d76781b7b6ece6fef64

This change adds tags functionality for projects in keystone. A user
can add a single tag with "--tag", chain "--tag" to add multiple
tags, or clear tags with "--no-tag".

Change-Id: I31cfef3e76dcefe299dacb00c11bb1a10a252628
Partially-Implements: bp project-tags

Add support for creating, retrieving, and deleting application
credentials. Application credentials do not support updates.

In order to provide a positive user experience for the `--role` option,
this patch also includes an improvement to the
`identity.common._get_token_resource()` function that allows it to
introspect the roles list within a token. This way there is no need to
make a request to keystone to retrieve a role object, which would fail
most of the time anyway due to keystone's default policy prohibiting
unprivileged users from retrieving roles.

bp application-credentials

Change-Id: I29e03b72acd931305cbdac5a9ff666854d05c6d7

Implements the commands that allow to link and endpoint to
a project for endpoint filter management.

Implements: blueprint keystone-endpoint-filter

Change-Id: Iecf61495664fb8413d35ef69f07ea929d190d002

Now, keystone has supported serverl auth method, like 'totp'.
Before we use this method, we should create the credential first.
And we need create it with type 'totp'. But now we cannot create
credential with this method.

Also, I think the type should not have constrains. We can create
any type in keystone project. So, we should do these actions too.
The type would be more which We cannot control.

Change-Id: Ie0482da3133fb515e4bb8e45f8c54f509589cc5e
Closes-bug: #1731848