httpinstance: retry request without ipa-ca.$DOMAIN dnsName on failure
    
    In the migration case of replica installation, if the CA server is
    an older version it may not support the ipa-ca.$DOMAIN dnsName in
    the HTTP cert (it is a special case in the cert_request command).
    Therefore if the request fails, try it again without the
    ipa-ca.$DOMAIN dnsName.
    
    Part of: https://pagure.io/freeipa/issue/8186
    
    Reviewed-By: Alexander Bokovoy <abbra@users.noreply.github.com>