Prevent misleading "partial match" error messages for disabled zones.
Following message was printed if zone "e.test" was disabled and LDAP
contained zones "test" and "e.test":
update_zone (psearch) failed for 'idnsName=e.test,cn=dns,dc=e,dc=org'. Zones can be outdated, run `rndc reload`: partial match
Signed-off-by: Petr Spacek <pspacek@redhat.com>