Ping is sent on the client side at {@link ClientSessionFactoryImpl}. At the server's side it is treated at {@link RemotingServiceImpl}
@see RemotingConnection#checkDataReceived()
@author Tim Fox
The PING protocol layer retrieves the initial membership (used by the GMS when started by sending event FIND_INITIAL_MBRS down the stack). We do this by mcasting PING requests to an IP MCAST address. The responses should allow us to determine the coordinator whom we have to contact, e.g. in case we want to join the group. When we are a server (after having received the BECOME_SERVER event), we'll respond to PING requests with a PING response.
@author Bela Ban
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