Crash when accessing /proc/net/tcp for hostinet

[tanjianfeng]

Commit 94a6bfa ("Implement /proc/net/tcp.") implements a way to lookup tcp stream information. It calls socket->GetSockName and GetPeerName to get the tcp connection information. However, hostinet returns address as []byte instead of linux.SockAddrInet, which leads to type assertion failure, and crash.

[tanjianfeng]

commit 7bfad8e ("Return a well-defined socket address type from socket funtions") fixed this issue.