changesets:10876:9e7175394c3c

base,dev: enable client/server socket for ethertap
This patch adds ConnectSocket class to "base/socket". This act like a client

socket that connects to a server on the specified "port" and "ip".
Also, it adds a new function "listenTap" to ListenSocket class. The usage of

this function is in pd-gem5 extenstion where we instantiate several ethertap

object for ethernet switch. "listenTap" function is called by the first instant of

ethertap. It initializes "fd_static", then other instants of ethertap does not

need to create a new socket and just accept incoming connection by calling

"acceptTap" function