Remove SslHttpClient?

I would like to remove this class and all the code (constructors in ``RemoteDocker``, mostly) that makes any assumption regarding securing communication with a remote Docker instance.

My reasoning is that we shouldn't make any assumptions since we will most likely not cover all the possibilities and we are just polluting the library. If the user really needs it and knows what they are doing, they can provide a properly configured ``HttpClient`` when instantiating a ``RemoteDocker``.

What do you think?

Comienza localizando SslHttpClient y los constructores de RemoteDocker; después, rastrea cómo dan por sentada la comunicación segura con una instancia remota de Docker. Revisa la discusión de los comentarios antes de decidir el alcance. Se considera terminado cuando se hayan eliminado esas suposiciones y el código relacionado, y los llamadores puedan proporcionar un HttpClient configurado.

Escrito por el modelo de indexación a partir del texto del issue.