ipatests: wait for replica update in test_dns_locations
test_ipa_ca_records and test_adtrust_system_records can fail with
NXDOMAIN, because it doesn't wait enough for the update on replica.
It can be resolved by waiting for the update with wait_for_replication.
Fixes: https://pagure.io/freeipa/issue/9504
Reviewed-By: Florence Blanc-Renaud <flo@redhat.com>