Using Docker volumes for persistent data in the bifrost container is
necessary for upgrading the bifrost services.

This change adds the following volumes:

* bifrost_httpboot
* bifrost_ironic
* bifrost_mariadb
* bifrost_rabbitmq
* bifrost_tftpboot

Ironic creates hardlinks between the TFTP master image store and the
HTTP root path when iPXE is enabled. With different Docker volumes
used for these locations we run into
https://bugs.launchpad.net/ironic/+bug/1507894 during deployment. If
we use a directory under /httpboot to store the master images this
issue is avoided.

Change-Id: I8653268d3598e7a59d2eb45c8750d45b6fc9e35f
Partially-implements: blueprint bifrost-upgrade

Using a kolla_logs volume ensures that logs are persistent beyond the
lifespan of the bifrost_deploy container. This is necessary to support
upgrading the bifrost services. It also opens the possibility of log
forwarding, although we do not currently deploy a fluentd container on
the bifrost host.

Change-Id: If3118cd75ccc87b0d003d5f382695aeaa43ed0f8
Partially-implements: blueprint bifrost-upgrade

TrivialFix

Change-Id: I778d0a55adf1302c7a6f0702fec3a381d851f3df

- This change addes the ability to deploy
  and bootstrap bifrost.
- This change introduces a deploy-bifrost
  command to kolla-ansible.

Change-Id: I62afcf348661add900c98904e90a15a0eddffd4b
Implements: blueprint bifrost-support