ipatests: test ipa-getkeytab server option
Test various usages of the -s/--server option:
* -s is defined, use it as the server
* no -s, use the host value from /etc/ipa/default.conf
* -s is '_srv_', do DNS discovery
https://pagure.io/freeipa/issue/8478
Signed-off-by: Rob Crittenden <rcritten@redhat.com>
Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>