This may not look hyper-elegant, but using ~Socket to do this
calls 'shutdown' first on the sockets, which closes the parent's
duplicate of the socket very unhelpfully. So close instead.
Don't touch and thus COW memory. We will leave the Socket Poll
around un-used, and un-polling from eg. the ForKit in the Kit
process.
Signed-off-by: Michael Meeks <michael.meeks@collabora.com>
Change-Id: I1328dee0278ce39350194c617acffa114887d523