ipatests: fix TestMigrateDNSSECMaster teardown
The test is installing master +DNSSEC, then replica and migrates the DNSSEC
to the replica.
During teardown, the replica is removed with ipa server-del. This operation
deletes the entries cn=DNS and cn=DNSSEC on the master, but if the
replication is stopped before the operations are replicated on the replica,
the replica may end up with a dangling cn=DNSSEC entry and no cn=DNS entry.
In this case ipa-server-install --uninstall on the replica will fail.
The fix: uninstall the DNSSec master as the last step of teardown
Related: https://pagure.io/freeipa/issue/7985
Signed-off-by: Florence Blanc-Renaud <flo@redhat.com>
Reviewed-By: Christian Heimes <cheimes@redhat.com>