Change-Id: If7d6e58b19f98ccb7cc4c209e458cb6f4f4765ad

Change-Id: I3c4d81f59bb61fdd23234777b8d839adecfe86f2
Story: 2004960
Task: 42324

The critical part of this commit is adapting code that was still
sourcing env-vars. This file was removed from Bifrost in the Victoria
release, breaking the `kayobe seed deployment image build` command.

The other changes are not yet breaking Kayobe:

1) Release notes claim that OpenStackClient is no longer installed when
   keystone is not enabled, but it appears to still be available. Use
   the ironic native baremetal command instead except in playbooks
   related to baremetal compute nodes (i.e. overcloud ironic).

2) The use of OS_CLOUD=bifrost-inspector is deprecated and should be
   replaced by OS_CLOUD=bifrost.

Change-Id: I25078e69acdf41a4ef9957f99fe5047de54b778d
Story: 2008558
Task: 41696

* Always use Python 3
* Drop code paths for CentOS 7
* Drop support for Yum
* Remove support for host NTP daemon, always use chrony
* Switch references from 'yum_install_epel' to 'dnf_install_epel'
* Remove overcloud host image workaround for tagged VLAN admin network
* Remove the kayobe.utils.yum_install function, which is unused

Change-Id: I368f6edafed9779658798fc342116b4c1b3ffd48
Story: 2006574
Task: 39481

This is more representative of the typical use case of applying all
security-related package updates rather than just specific ones.

Also escape `*`, since most people will need to do so in their shell.

Change-Id: Ibd602b7fe30d7c6eb7c81b5f028ab6b5852da988

Change-Id: I6edda0527a892c55261cc6fc48a0feb899b348d6

Add information on updating package repos and rebooting after a kernel
update.

Change-Id: If6b637a0fac58ac7564c051e15b86a483b040a34

Change-Id: I019fc3f5c59c383215febb958f9c4cf8c8b8e4a6
Story: 2003312
Task: 24270

Adds instructions for a database backup.

Change-Id: I97c4bdb4e5d7d28c06a03ceb1cc290db9b1dccb5
Story: 2004359
Task: 27959

The administration guide has become a bit bloated, and not well
organised. This change creates new subsections within it.

Change-Id: I8aa133c183fb6b7d87a86d5ab66cc7faa5e64112
Story: 2004337
Task: 28082