Generate the certificate to be used for koji in make-certs.sh by
the same CA that also generates the composer and client certs.
Create a single certificate that uses the SubjectAltName (SAN)
extension to cover two domains: localhost, org.osbuild.koji.koji,
which previously was done via two separate certificates; this is
the legacy usage which stopped working with go 1.15 (see previous
commit). As a consequence the apache config is modified to use
only one virtual host with a ServerAlias directive.
630d09f6c4