FABG-943 Remove unused code (hyperledger#76)

The caching of discovered peers in the network object was never used.  This commit removes that code.

Signed-off-by: andrew-coleman <[email protected]>

pkg/gateway/network.go

@@ -20,7 +20,6 @@ type Network struct {
 	name    string
 	gateway *Gateway
 	client  *channel.Client
-	peers   []fab.Peer
 	event   *event.Client
 }
 
@@ -44,18 +43,6 @@ func newNetwork(gateway *Gateway, channelProvider context.ChannelProvider) (*Net
 
 	n.name = ctx.ChannelID()
 
-	discovery, err := ctx.ChannelService().Discovery()
-	if err != nil {
-		return nil, errors.Wrap(err, "Failed to create discovery service")
-	}
-
-	peers, err := discovery.GetPeers()
-	if err != nil {
-		return nil, errors.Wrap(err, "Failed to discover peers")
-	}
-
-	n.peers = peers
-
 	n.event, err = event.New(channelProvider, event.WithBlockEvents())
 	if err != nil {
 		return nil, errors.Wrap(err, "Failed to create new event client")