CA-less installer options usability fixes
    
    The --*_pkcs12 options of ipa-server-install and ipa-replica-prepare have
    been replaced by --*-cert-file options which accept multiple files.
    ipa-server-certinstall now accepts multiple files as well. The files are
    accepted in PEM and DER certificate, PKCS#7 certificate chain, PKCS#8 and
    raw private key and PKCS#12 formats.
    
    The --root-ca-file option of ipa-server-install has been replaced by
    --ca-cert-file option which accepts multiple files. The files are
    accepted in PEM and DER certificate and PKCS#7 certificate chain formats.
    
    The --*_pin options of ipa-server-install and ipa-replica-prepare have been
    renamed to --*-pin.
    
    https://fedorahosted.org/freeipa/ticket/4489
    
    Reviewed-By: Petr Viktorin <pviktori@redhat.com>