Allow choosing CA-less server certificates by name
Added new --*-cert-name options to ipa-server-install and ipa-replica-prepare
and --cert-name option to ipa-server-certinstall. The options allows choosing
a particular certificate and private key from PKCS#12 files by its friendly
name.
https://fedorahosted.org/freeipa/ticket/4489
Reviewed-By: Petr Viktorin <pviktori@redhat.com>