providers: Move hostid from ipa to sdap, v2 In the ldap provider, all option names are renamed to ldap_host_*. In the ipa provider the names haven't been changed. Host lookups for both ipa and ldap are handled in the ldap provider. sss_ssh_knownhostsproxy works but hostgroups are still only available in the ipa provider. I've also added some documentation for the ldap provider. Reviewed-by: Jakub Hrozek <jhrozek@redhat.com>