Support Neutron network mtu configuration with a new argument, --mtu
that allows CLI users to set MTU for Neutron networks.

Change-Id: I93d23581c7e8c84eaf9bb3b293360036f60f456b

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 patchset implements support for "--dns-domain" argument to the
following commands: "openstack port create" / "openstack port set".

Change-Id: I4bb001054b00a969b74db3bb310e567033bf589b
Depends-On: https://review.openstack.org/#/c/500660/
Closes-Bug: #1714878
Partial-Bug: #1704769

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

Change-Id: Iace9272b22ec8ccc8790e63c3f5e435d497c5e71