Added a new option --external-ca-type which specifies the type of the external CA. It can be either "generic" (the default) or "ms-cs". If "ms-cs" is selected, the CSR generated for the IPA CA will include MS template name extension (OID 1.3.6.1.4.1.311.20.2) with template name "SubCA". https://fedorahosted.org/freeipa/ticket/4496 Reviewed-By: Martin Kosek <mkosek@redhat.com>