Add support for doing upcalls to the rpctlssd and rpctlscd daemons after
the TLS handshake. For now, the only one of these is disconnect when
the connection is done.
The userland "SSL *" is referenced by a refno (uint64_t) and the time
at which the daemon was started.
If a daemon is restarted, the connections are then "orphaned" and no
further upcalls will work for them.
As such, restarting the daemons should be avoided.