Feature request: tls_stream::set_hostname

[anarthal]

At the moment, the only way of setting the hostname (for verification and SNI) is using tls_context. This precludes tls_stream from being used for connections that target different hostnames.

Say, for example, an HTTP redirection:

• A stream is created from a context. The hostname is set in this context.
• TLS handshake succeeds.
• The HTTP server returns a redirection code, with a different hostname on it.
• The stream is reset().
• How do I change the hostname on this reset stream?