Adding new features to WebService

[kevin-w-du]

Priority: LOW (I am adding it here now, otherwise I would forget about it).

We can add new APIs to WebService to allow users to add websites to the service. Basically the APIs will add a virtual host file to the web server's configuration folder, and run command to enable the website.

We should have one API for HTTP, another one for HTTPS sites. For HTTPS sites, users will need to provide the server's private key and certificate, or let the container generate the certificate automatically (we do need to provide a root CA as the argument, so all the certificates can be generated from this root CA, which is created by ourselves). I have all the script in the PKI and TLS labs. When we implement these APIs, I will provide all the certificate scripts to save time.

With these new APIs, the current PKI and TLS labs can use this emulator as the basis. The activities can become more interesting.