Refactor part 2: change Socket::new to only call socket(2) #110
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If socket2 is going to be a fully configuration socket(2) wrapper, then
the user needs to determine if things like setting CLOEXEC is desirable.
The new example shows the common case of setting all those flags.
We should consider adding a
Socket::new_with_common_flags()
, which would create a socket with all advisable flags set such as in the new example.