Exchange master socket port number on client socket creation: gras_socket_peer_port...

Exchange master socket port number on client socket creation: gras_socket_peer_port on an accepted socket will point to the port on which the peer is listening, not the one on which he is speaking since the latter is assigned by the system and meanless to human beings

git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/simgrid/simgrid/trunk@2343 48e7efb5-ca39-0410-a469-dd3cf9ba447f