database providers missing

[f3rr]

DB Providers are missing from director.pp except pgsql.

should be something like:
case $db_type {
/^(pgsql|postgresql)$/: { include bacula::director::postgresql }
/^(mysql)$/: { include bacula::director::mysql }
....
....
default: { fail('No db_type set') }

[zachfi]

PRs for this are welcome.