The upgrade script set the "psearch" directive in some circumstances,
but did not remember that it was set, so later, when setting
minimum_connections, it assumed psearch is not set.
Also, the script did not set minimum_connections if the directive wasn't
already there. It should be set in that case.
Related to https://fedorahosted.org/freeipa/ticket/2554
Petr Viktorin
e578183ea2