Remove invalid test case for DNS SRV priority
Upstream dnspython 2.1.0 introduced additional error checking
on SRV values and now rejects invalid priorities.
Remove the sorting test for priority of -1.
https://pagure.io/freeipa/issue/8650
Signed-off-by: Rob Crittenden <rcritten@redhat.com>
Reviewed-By: Florence Blanc-Renaud <flo@redhat.com>