Fix up new OpenLDAP MMR code.

Fix up new OpenLDAP MMR code.

This changes the MMR password from hard-coded value of 'linux',
adds tests and fixes the Fedora DS backend.

Currently the MMR password matches the admin password, but we can
change this to be another random value if required.

Also require the port to be specified on the command line, so we don't
hard-code a port of 9000.

Andrew Bartlett
(This used to be commit 08257c6d6ce809fcd53f9b2b4d558fef616b74ce)