update them to the new tokio-openssl API and remove socket buffer size
setting - it was removed from the TcpStream API, and is now only
available via TcpSocket (which can in turn be converted to a
TcpListener), but this is not needed for this example.
Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>
These aren't installed and are only used for manual testing,
so there's no reason to force them to be built all the time.
Signed-off-by: Wolfgang Bumiller <w.bumiller@proxmox.com>