* Fix various typos and formatting.
* Add documentation about custom collector backend.
* Add documentation about custom storage backend.

Change-Id: If937afc5ce2a2747f464fbaf38a5dcf2e57ba04f
Closes-bug: #1940842

Sometimes, the registries may intermittently fail to deliver the
images. This is often seen in the CI, though it also happens with
production deployments, even those with internal registries and/or
registry mirrors - due to sheer load when trying to pull the
images from many hosts.

This patchs adds two new vars to control retry behaviour.
The default has been set to make users happier by default. :-)

Change-Id: I81ad7d8642654f8474f11084c6934aab40243d35

It seems to have been mistakenly introduced by
de00bf49
"Simplify handler conditionals"

Change-Id: I65b6e322fa11a870f32099bbfd62150cbea4feb5

Signed-off-by: Marc 'risson' Schmitt <marc.schmitt@risson.space>
Closes-Bug: #1940286
Change-Id: I647f8615e9fd0cc0db7c737ce4afbd1bdd0d40d4

Signed-off-by: Marc 'risson' Schmitt <marc.schmitt@risson.space>
Change-Id: I374f7427a4318d00ca474367818117e11789ec13

Debian upgrades failed on using the ansible command to remove
chrony service because of broken python autodetection.
This patch uses the same workaround we have in globals-default.j2.
This is not nice long-term but there is no reason to keep the two
out of sync. We should remove this workaround from both places
when the situation fixes itself (possibly with newer Ansible).

Change-Id: I8b7f0c76d55cd31311285ce746acb6335e044470

Change-Id: I2fe738249018e25e79fd726bc931be6b7bd91934

Kolla-ansible upgrade task is calling different
handlers as deploy task and these handlers are
missing healthcheck key. This patch is fixing
this.

Closes-Bug: #1939679
Change-Id: Id83d20bfd89c27ccf70a3a79938f428cdb5d40fc

We get a nice optimisation by using a filtered loop instead
of task skipping per service with 'when'.

Partially-Implements: blueprint performance-improvements
Change-Id: I8f68100870ab90cb2d6b68a66a4c97df9ea4ff52

Follow up for I0c7e9a28876a1d4278fb2ed8555c2b08472864b9 which added a
ironic_enable_keystone_integration variable to support Ironic in
multi-region environments. This change skips Keystone service
registration based on ironic_enable_keystone_integration rather than
enable_keystone. It also updates the ironic-inspector.conf template to
use the new variable.

Change-Id: I2ecba4999e194766258ac5beed62877d43829313

Change-Id: I0103d7ef55e6aebe043a582d36f1a2efa137f447

Missing comma in config.json template rendered invalid JSON with VMware
plugin agent.

Closes-Bug: #1939080

Change-Id: I3d0c6421e3da7e1e753b99cf87c32fc238a21523

Dumper and Loader are classes seem to be loaded but not used in the merge_yaml
file. This change removes them for reducing the number of lines.

Change-Id: I87ef305903ab02226fcaa725ece622647d17811c

Basically, there are three main installation scenario:

Scenario 1:
Ironic installation together with other openstack services
including keystone. In this case variable enable_keystone
is set to true and keystone service will be installed
together with ironic installation. It is possible realise this
scenario, no fix needed

Scenario 2:
Ironic installation with connection to already installed
keystone. In this scenario we have to set enable_keystone
to “No” to prevent from new keystone service installation
during the ironic installation process. But in other hand,
we need to have correct sections in ironic.conf to provide
all information needed to connect to existing keystone.
But all sections for keystone are added to ironic.conf only
if enable_keystone var is set to “Yes”. It isn’t possible
to realise this scenario. Proposed fix provide support for
this scenario, where multiple regions share the same
keystone service.

Scenario 3:
No keystone integration. Ironic don't connect to Keystone.
It is possible realise this scenario, no fix needed

Proposed solution also keep the default behaviour: if no
enable_keystone_integration is manually defined by default
it takes value of enable_keystone variable and all behaviour
is the same. But if we don't want to install keystone and
want to connect to existing one at the same time, it will be
possible to set enable_keystone var to “No”
(preventing keystone from installation) and at the same
time set ironic_enable_keystone_integration to Yes to allow
needed section appear in ironic.conf through templating.

Change-Id: I0c7e9a28876a1d4278fb2ed8555c2b08472864b9