Bind mount tripleo.cnf in transient bootstrap containers

Bind mount tripleo.cnf in transient bootstrap containers

Various containerized services (e.g. nova, neutron, heat) run initial set up
steps with some ephemeral containers that don't use kolla_start. The
tripleo.cnf file is not copied in /etc/my.cnf.d and this can break some
deployments (e.g. when using internal TLS, service lack SSL settings).

Fix the configuration of transient containers by bind mounting of the
tripleo.cnf file when kolla_start is not used.

Change-Id: I5246f9d52fcf8c8af81de7a0dd8281169c971577
Closes-Bug: #1710127
Co-Authored-By: Juan Antonio Osorio Robles <jaosorior@redhat.com>