socket: simplify, make SocketSet private. #571
Merged
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This completes the work started in #557.
Since
Interface
now owns the sockets,SocketSet
is now an implementation detail, so it is made private.Also
SocketMeta
is moved from each socket to the SocketSet.SocketMeta
is arguably anInterface
implementation detail as well, mainly used for neighbor discovery. it also reduces a bit of code duplication.