[FAB-11838] Add INFO logging for anchor peers

This change set adds an INFO level logging message that contains
the endpoints of the anchor peers (and the corresponding org name)
whenever gossip channel reconfiguration takes place.

Change-Id: I9c2198917f0a230e8d50ca1d6d93c7824b71350b
Signed-off-by: yacovm <yacovm@il.ibm.com>

Author: yacovm

gossip/gossip/gossip_impl.go

@@ -181,8 +181,9 @@ func (g *gossipServiceImpl) JoinChan(joinMsg api.JoinChannelMessage, chainID com
 	// joinMsg is supposed to have been already verified
 	g.chanState.joinChannel(joinMsg, chainID)
 
+	g.logger.Info("Joining gossip network of channel", string(chainID), "with", len(joinMsg.Members()), "organizations")
 	for _, org := range joinMsg.Members() {
-		g.learnAnchorPeers(org, joinMsg.AnchorPeersOf(org))
+		g.learnAnchorPeers(string(chainID), org, joinMsg.AnchorPeersOf(org))
 	}
 }
 
@@ -213,7 +214,12 @@ func (g *gossipServiceImpl) periodicalIdentityValidation(suspectFunc api.PeerSus
 	}
 }
 
-func (g *gossipServiceImpl) learnAnchorPeers(orgOfAnchorPeers api.OrgIdentityType, anchorPeers []api.AnchorPeer) {
+func (g *gossipServiceImpl) learnAnchorPeers(channel string, orgOfAnchorPeers api.OrgIdentityType, anchorPeers []api.AnchorPeer) {
+	if len(anchorPeers) == 0 {
+		g.logger.Info("No configured anchor peers of", string(orgOfAnchorPeers), "for channel", channel, "to learn about")
+		return
+	}
+	g.logger.Info("Learning about the configured anchor peers of", string(orgOfAnchorPeers), "for channel", channel, ":", anchorPeers)
 	for _, ap := range anchorPeers {
 		if ap.Host == "" {
 			g.logger.Warning("Got empty hostname, skipping connecting to anchor peer", ap)