Create volumes for Bifrost's persistent data

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

ansible/roles/bifrost/tasks/bootstrap.yml

@@ -37,3 +37,17 @@
      chown ironic:ironic /home/ironic/.ssh/id_rsa &&
      chown ironic:ironic /home/ironic/.ssh/id_rsa.pub &&
      chown ironic:ironic /home/ironic/.ssh/config'
+
+# Ironic creates hardlinks between the TFTP master image store and the
+# HTTP root path when iPXE is enabled. With 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.
+- name: Configuring TFTP master image path
+  command: |
+    docker exec bifrost_deploy
+    bash -c 'cat >> /etc/ironic/ironic.conf << EOF
+    [pxe]
+    tftp_master_path = /httpboot/master_images
+    EOF
+    systemctl restart ironic-conductor'

ansible/roles/bifrost/tasks/start.yml

@@ -11,3 +11,8 @@
       - "/etc/localtime:/etc/localtime:ro"
       - "/dev:/dev"
       - "kolla_logs:/var/log/kolla/"
+      - "bifrost_httpboot:/httpboot/"
+      - "bifrost_ironic:/var/lib/ironic/"
+      - "bifrost_mariadb:/var/lib/mysql/"
+      - "bifrost_rabbitmq:/var/lib/rabbitmq/"
+      - "bifrost_tftpboot:/tftpboot/"

releasenotes/notes/bifrost-persistent-data-019294fe3326cf82.yaml

+---
+features:
+  - |
+    Adds Docker volumes for storing persistent data in the ``bifrost_deploy``
+    container on the deployment host.