After performing a recovery of MariaDB, the mariadb containers are left
without a restart policy. This leaves them unable to recover from the
crash of a single galera node. There is another issue, in that the
'master' node is left in a bootstrap configuration, with the
--wsrep-new-cluster argument configured as BOOTSTRAP_ARGS.

This change fixes these issues by removing the restart policy of 'no'
from the 'slave' containers, and recreating the master container without
the restart policy or bootstrap arguments.

Change-Id: I36c875611931163ca2c29ae93b71d3af64cb197c
Closes-Bug: #1851594