blueprint database-backup-recovery

Introduce a new option, mariadb_backup, which takes a backup of all
databases hosted in MariaDB.

Backups are performed using XtraBackup, the output of which is saved to
a dedicated Docker volume on the target host (which defaults to the
first node in the MariaDB cluster).

It supports either full (the default) or incremental backups.

Change-Id: Ied224c0d19b8734aa72092aaddd530155999dbc3

kolla-ansible support yaml format for policy file[1] too, but the
docs missing it, this ps to add it.

[1]: https://github.com/openstack/kolla-ansible/blob/master/ansible/group_vars/all.yml#L393
Closes-Bug: #1804455

Change-Id: I44eb1d64f9299ccaf99972c8b5354683a3501f6b

Following by https://review.openstack.org/#/c/605097/
These were used by now-dead tooling. We can remove them.

Change-Id: I0953751044f038a3fdd1acd49b3d2b053ac4bec8

Change-Id: I0e8b4b443a0659e75a80de1dd1f6418ff2793d2f
Closes-Bug: #1771257

For compliance with the Project Testing Interface [1]
as described in [2]

[1]
https://governance.openstack.org/tc/reference/project-testing-interface.html
[2]
http://lists.openstack.org/pipermail/openstack-dev/2017-December/125710.html

doc8 command is dropped from docs tox envs.
So this affect nothing and run in PEP8.

Related-Bug: #1765348

Depends-On: Icc7fe3a8f9716281de88825e9d5b2fd84de3d00a
Change-Id: Idf9a16111479ccc64004eac9508da575822a3df5

With libvirt 2.0, when using qemu cpu mode is not properly
evaluated and need to be set to cpu_mode = none.

Add this option when kvm is not supported, otherwise user
will still facing errors when launching instances over qemu.

Change-Id: I1e25fc5429b92f77ce87f537467f97b510fa154a

We upgrade the rst convention by following Documentation Contributor
Guide[1].

[1] https://docs.openstack.org/doc-contrib-guide

Change-Id: I89e437b83b0e6a7c1bbfbf4a02a530be072eca91
Partially-Implements: blueprint optimize-the-documentation-format

Change-Id: I133bd7ed5ac62b9614dece70ceb8016398c138f6
Co-authored-By: Duong Ha-Quang <duonghq@vn.fujitsu.com>
Closes-Bug: #1722744

Everyone know how to override default cpu allocation ratio via it.

Change-Id: I059f5167be170b617a440e2e06b421f9062843a6

Created the admin directory, remove some files from
user dir and placed into admin and contributor.

For more detail, see the doc migration spec.
http://specs.openstack.org/openstack/docs-specs/specs/pike/os-manuals-migration.html

Change-Id: I84c565d7d14a4d90270a53e14ab93a10f7ffb9b7
Partially-Implements: blueprint ka-queens-doc-restructure