[Pki-devel] [PATCH] 697 Additional clean-ups for PKCS #12 utilities.

The pki_server_external_cert_path has been renamed to pki_server_external_certs_path to match the file name. A default pki_server_external_certs_path has been added to default.cfg. The pki pkcs12-export has been modified to export into existing PKCS #12 file by default. The pki-server instance-cert-export has been modified to accept a list of nicknames to export. https://fedorahosted.org/pki/ticket/1742 -- Endi S. Dewata