Set got_fin if in CS_SYN_RECV state and receive ST_FIN
#112
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Currently the server socket ignores the ST_FIN packet when in CS_SYN_RECV state. So when the other end closes the connection, the socket in CS_SYN_RECV state has no other option than to timeout.
This commit causes the serving socket not to ignore the ST_FIN packet in that state so that it can exit early.