In some operation systems, the sys info contains invalid characters.
In this patch try to keep the original fallback logic but filter out the cases when the character is invalid.
Right now Signal Service runs the Let'sEncrypt manager on port 80
and a gRPC server on port 10000. There are two separate listeners.
This PR combines these listeners into one with a cmux lib.
The gRPC server runs on either 443 with TLS or 80 without TLS.
Let's Encrypt manager always runs on port 80.
