* Updates etcd to v3.4
* Updated the config to use v3.4's logging mechanism
* Deprecated etcd CA parameters aren't used, so we are not affected
by their removal.
* Note that we are not currently guarding against skip-version updates for
etcd.
Notable non-voting jobs exercising some of this:
* kolla-ansible-ubuntu-upgrade-cephadm (cinder->tooz->etcd3gw->etcd)
* kolla-ansible-ubuntu-zun (see
https://review.opendev.org/c/openstack/openstack-ansible/+/883194 )
Depends-On: https://review.opendev.org/c/openstack/kolla/+/890464
Change-Id: I086e7bbc7db64421445731a533265e7056fbdb43
This commit addresses a few shortcomings in the etcd service:
* Adding or removing etcd nodes required manual intervention.
* The etcd service would have brief outages during upgrades or
reconfigures because restarts weren't always serialised.
This makes the etcd service follow a similar pattern to mariadb:
* There is now a distiction between bootstrapping the cluster
and adding / removing another member.
* This more closely follows etcd's upstream bootstrapping
guidelines.
* The etcd role now serialises restarts internally so the
kolla_serial pattern is no longer appropriate (or necessary).
This does not remove the need for manual intervention in all
failure modes: the documentation has been updated to address the
most common issues.
Note that there's repetition in the container specifications: this
is somewhat deliberate. In a future cleanup, it's intended to reduce
the duplication.
Change-Id: I39829ba0c5894f8e549f9b83b416e6db4fafd96f
