Make a new API to hide some the implementation of eventfd, timerfd
and signalfd along with clock and read/write/ioctl/close functions.
We would like to have plugins use the abstractions so that we
can switch them to something else when needed.
Add hooks that contain protocol specific interfaces that can be used
to extend the protocol. This makes it possible to add new interfaces
to the protocol and implement the protocol specific data transport.
Move these protocol specific extension to the extensions directory.