Hide a plaintext SNI in snifd/srv.c

snifd/srv.c, the listener for connections from the server processes on the end IoT devices,
relays the TLS traffic for the matched socket without any modifications, including the client TLS hello with a plaintext SNI record.
However, the server process on the end IoT device generally doesn't need a legible SNI.
Would like to explore the possibility of hiding or disguising the SNI hostname in snifd/cln.c connection
without breaking the end-to-end TLS stream.