All certificates and proxies are now created on demand using a throw-away CA
and voms-proxy-fake.

The conf.d directory contains the configurations for the various
CA and EE certificates, starting from the x509-scripts repo.

eec_subject2 subsumes eec_cert2.

Note how the response is not hardcoded, but is computed from the used
certificate.

Merge it with eec_cert1.t.

Comments related to the previous commit

The nginx used in this branch is the last stable one and not a version compiled by us. To run it inside a container without the root privileges, we have to adapt some configuration in the nginx.conf file. See https://hub.docker.com/_/nginx at section "Running nginx as a non-root user"

Deleted a part related to an unspoorted feture

Certificates removed:
* 5.pem
* 6.pem
* 9.pem