Remove sepia dependency (use fqdn)

Fixes: #10255
Signed-off-by: Warren Usui <warren.usui@inktank.com>
Merge pull request #3212 from ceph/wip-10255-wusui

Remove sepia dependency (use fqdn)

Backport: giant
Reviewed-by: Sage Weil <sage@redhat.com>