krb5: Write multiple dnsnames into kdc info file
Multiple servers should be written to kdc info file. In
this PR we iterate trough server list and we write
list of primary servers followed by backup servers.
Resolves:
https://pagure.io/SSSD/sssd/issue/3974
Reviewed-by: Sumit Bose <sbose@redhat.com>
(cherry picked from commit 208a79a83c76b6693bdf927c3d7d6267e3218b0b)