mariadb: Move generation of systemd drop-in to puppet-tripleo

Systemd starts mariadb as user mysql, so in order to allow a large
number of connections (e.g. max_connections=4096) it is necessary to
raise the file descriptor limit via a system drop-in file.

When installing an undercloud, such drop-in file is currently
generated by instack-undercloud (in file puppet-stack-config.pp). But
non-HA overcloud also need such drop-in to be generated.

In order to avoid duplicating code, the drop-in creation code should
be provided by puppet-tripleo. By default, no drop-in is generated;
it has to be enabled by instack-undercloud or tripleo-heat-template
once they will use it (resp. to create undercloud or non-HA overcloud).

This patch does not aim at generating a dynamic file limit based on
the number of connections, this should land in another dedicated
patch.  Instead, it just reuses the limit currently set for undercloud
and HA-overclouds.

Also, the generation of the drop-in does not force a mysql restart
like it currently does in instack-undercloud, to avoid unexpected
service disruption on a non-HA overcloud after a minor update.

Co-Authored-By: Tim Rozet <trozet@redhat.com>

Depends-On: I7ca7b5f7614971455cae2bf7c4bf8264b642b0dc

Change-Id: Ia0907b2ab6062a93fb9363e39c86535a490fbaf6
Partial-Bug: #1648181
Related-Bug: #1524809

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