Netgroups should ignore the 'use_fully_qualified_names' setting
Netgroups often have memberNisNetgroup entries included in them
that will never process correctly if we require fully-qualified
names on the nested lookup. This patch alters the behavior of
netgroup lookups to check *all* domains for an unqualified
netgroup name, instead of only the ones not requiring fully-
qualified names.
https://fedorahosted.org/sssd/ticket/2013