Added configuration to change default db config to file-per-table config.

This is directed toward InnoDB. It appears there is an assumption
that puppet-dashboard should be running in non-transaction safe mode,
which is the default. This resolves the dependency for that assumption.

Change-Id: I50dabea856f38fa6e8d4d3c589eb98f12a22457a
Reviewed-on: https://review.openstack.org/24334
Reviewed-by: Khai Do <zaro0508@gmail.com>
Reviewed-by: James E. Blair <corvus@inaugust.com>
Approved: Jeremy Stanley <fungi@yuggoth.org>
Reviewed-by: Jeremy Stanley <fungi@yuggoth.org>
Tested-by: Jenkins