[FAB-3755] Gossip:Add remote peer endpoint to ConnInfo

In gossip we have the following struct that can be extracted
from a point-to-point message:

type ConnectionInfo struct {
    ID       common.PKIidType
    Auth     *AuthInfo
    Identity api.PeerIdentityType
}

In the logs we write the ID of the peer but it's a byte slice,
and doesn't tell much about the peer.

On the other hand, when a remote peer connects to a peer,
we extract its endpoint anyway.

I added the endpoint to the struct and added an assignment
at the handshake time.

Change-Id: If29abda09f2b066332099a45328c26027641215b
Signed-off-by: Yacov Manevich <yacovm@il.ibm.com>

gossip/comm/comm_impl.go

@@ -465,6 +465,7 @@ func (c *commImpl) authenticateRemotePeer(stream stream) (*proto.ConnectionInfo,
 	connInfo := &proto.ConnectionInfo{
 		ID:       receivedMsg.PkiId,
 		Identity: receivedMsg.Cert,
+		Endpoint: remoteAddress,
 	}
 
 	// if TLS is enabled and detected, verify remote peer

gossip/gossip/channel/channel.go

@@ -380,11 +380,11 @@ func (gc *gossipChannel) HandleMessage(msg proto.ReceivedMessage) {
 	}
 	orgID := gc.GetOrgOfPeer(msg.GetConnectionInfo().ID)
 	if len(orgID) == 0 {
-		gc.logger.Debug("Couldn't find org identity of peer", msg.GetConnectionInfo().ID)
+		gc.logger.Debug("Couldn't find org identity of peer", msg.GetConnectionInfo())
 		return
 	}
 	if !gc.IsOrgInChannel(orgID) {
-		gc.logger.Warning("Point to point message came from", msg.GetConnectionInfo().ID,
+		gc.logger.Warning("Point to point message came from", msg.GetConnectionInfo(),
 			", org(", string(orgID), ") but it's not eligible for the channel", string(gc.chainID))
 		return
 	}

gossip/gossip/gossip_impl.go

@@ -339,7 +339,7 @@ func (g *gossipServiceImpl) handleMessage(m proto.ReceivedMessage) {
 
 	msg := m.GetGossipMessage()
 
-	g.logger.Debug("Entering,", m.GetConnectionInfo().ID, "sent us", msg)
+	g.logger.Debug("Entering,", m.GetConnectionInfo(), "sent us", msg)
 	defer g.logger.Debug("Exiting")
 
 	if !g.validateMsg(m) {

protos/gossip/extensions.go

@@ -336,10 +336,18 @@ type ConnectionInfo struct {
 	ID       common.PKIidType
 	Auth     *AuthInfo
 	Identity api.PeerIdentityType
+	Endpoint string
 }
 
-func (connInfo *ConnectionInfo) IsAuthenticated() bool {
-	return connInfo.Auth != nil
+// String returns a string representation of this ConnectionInfo
+func (c *ConnectionInfo) String() string {
+	return fmt.Sprintf("%s %v", c.Endpoint, c.ID)
+}
+
+// IsAuthenticated returns whether the connection to the remote peer
+// was authenticated when the handshake took place
+func (c *ConnectionInfo) IsAuthenticated() bool {
+	return c.Auth != nil
 }
 
 // AuthInfo represents the authentication