server: prevent increasing epochErrors if conn was established

In this commit, we fix a small bug where we would increase epochErrors
by one even if connections were successfully established. Due to this,
we would stay stuck inside of the peer bootstrapper loop without
requerying for new peers.

server.go

@@ -1346,6 +1346,10 @@ func (s *server) peerBootstrapper(numTargetPeers uint32,
 					s.connectToPeer(a, errChan)
 					select {
 					case err := <-errChan:
+						if err == nil {
+							return
+						}
+
 						srvrLog.Errorf("Unable to "+
 							"connect to %v: %v",
 							a, err)
@@ -1413,6 +1417,9 @@ func (s *server) initialPeerBootstrap(ignore map[autopilot.NodeID]struct{},
 				// us down.
 				select {
 				case err := <-errChan:
+					if err == nil {
+						return
+					}
 					srvrLog.Errorf("Unable to connect to "+
 						"%v: %v", addr, err)
 				// TODO: tune timeout? 3 seconds might be *too*