TLS handshake support for NFS and other in-kernel TLS users

 In-kernel TLS consumers need a mechanism to perform TLS handshakes on
 a connected socket to negotiate TLS session parameters that can then
 be programmed into the kernel's TLS record protocol engine.
 .
 This package of software provides a TLS handshake user agent that
 listens for kernel requests and then materializes a user space socket
 endpoint on which to perform these handshakes. The resulting
 negotiated session parameters are passed back to the kernel via
 standard kTLS socket options.