Add HttpServer.listenOnSecure

[zanderso]

HttpServer has a named constructor listenOn that takes a ServerSocket. A SecureServerSocket is not a ServerSocket and so looks like it can't be passed to listenOn. Without this, there is no way to set up a secure HttpServer with an onBadCertificate callback.

[zanderso]

HttpServer.bindSecure should also take an optional named onBadCertificate callback parameter.

[makon]

@zanderso Did you find any workaround for this issue?
I am trying to set the requireClientCertificate property from SecureServerSocket to use it in an HttpServer, but I can't find a solution for it.

[zanderso]

cc @brianquinlan may now be more familiar with this area.