This is virtually always desirable, since
without it we may fail to bind after recycling
if the previous socket is TIME_WAIT.
However, if a socket is bound to same address
this will not prevent the failure to bind,
and we'll detect that the address/port is busy.
So the advantage is in minimizing recycling time.
Change-Id: Ib3bbbf7065f9822acfbd2d7f8ff3e8951739c0ef
The new socket class is implicitly
non-blocking, streaming, ipv4 socket.
Ipv6 to be added later, as necessary.
Change-Id: I722cc63ea97394d47a50b733c58a69cc1529d815
