Modernize testing

Without this, we would still test two different requirements,
a very old 2.10, and a relatively new ansible.

There is no reason to maintain the 2.10 testing framework, we
can simply modernize the whole system.

This allowed us to bump ansible-lint, and adopt the new lint
recommendations, which are adapted here.

I now also moved back to use Vagrant again, since the molecule
docker is AGAIN broken.

Fixes: #271

Implement track_process (#278)

Without this patch, a user is forced to use track_script with pgreps or kills to track process

This is not a problem in itself, but is error prone.

This patch fixes it by exposing in the role the track_process feature of keepalived.

The initial implementation was validating some of the track_process inputs directly in the role,
under the form of `param_match in ['initial', 'partial']`. 
Yet, this provides a different result (the incorrect data is silently not templated,
and no error is thrown) as a deployer would expect.

Instead, we rely on the fact that keepalived will throw a warning, and the user can
check it if necessary.

Merge pull request #275 from dhoffend/inhibit-on-failure

Support virtualserver/inhibit_on_failure

Merge pull request #221 from evrardjp/monthly-test-of-keepalived

Add monthly test of keepalived

Merge pull request #202 from maxkochubey/feat/auth-type-option

Make "auth_type" variable optional with default value

Add the sorry_server directive support

Cf keepalived/doc/samples/keepalived.conf.sample in keepalived source.

Merge pull request #185 from mmetz-isa/add-opt-params

Add various optional parameters

Merge pull request #173 from evrardjp/incomplete-notify-master-rx-low…

…er-pri

fix: Remove incorrect sync_group notify_master_rx_lower_pri

Merge pull request #171 from evrardjp/fix_notify_master_rx_lower_pri

Remove notify_master_rx_lower_pri from sync_group

Merge pull request #166 from eifelmicha/master

Add config option "notify_master_rx_lower_pri"