ipatests: fix expected output for ipahealthcheck.ipa.files
With ipa-healthcheck 0.8, the test ipahealthcheck.ipa.files is able
to return a list of possible owners/groups as a comma-separated string
instead of a single owner/group (see commit 930ec5f).
The test output needs to be fixed accordingly.
Fixes: https://pagure.io/freeipa/issue/8662
Signed-off-by: Florence Blanc-Renaud <flo@redhat.com>
Reviewed-By: Rob Crittenden <rcritten@redhat.com>