Server does not detect different server and IPA domain
    
    Server installer does not properly recognize a situation when server
    fqdn is not in a subdomain of the IPA domain, but shares the same
    suffix.
    
    For example, if server FQDN is ipa-idm.example.com and domain
    is idm.example.com, server's FQDN is not in the main domain, but
    installer does not recognize that. proper Kerberos realm-domain
    mapping is not created in this case and server does not work
    (httpd reports gssapi errors).
    
    https://fedorahosted.org/freeipa/ticket/4012