Fixing gossip Stop on z

When gossip service instantiated and stopped right after that,
it cause the probem with one of WaitGroups - its Wait method
called before any of Add called. So, we add in test some time
between gossip service instantiation and its Stop.

Change-Id: Ib9ad6ad855f81c6cfeb83f03f2e3506bd0ddc1a0
Signed-off-by: Gennady Laventman <[email protected]>

Author: gennadylaventman

gossip/service/gossip_service_test.go

@@ -22,6 +22,8 @@ import (
 	"sync"
 	"testing"
 
+	"time"
+
 	"github.com/hyperledger/fabric/gossip/api"
 	"github.com/hyperledger/fabric/msp/mgmt"
 	"github.com/hyperledger/fabric/msp/mgmt/testtools"
@@ -59,6 +61,8 @@ func TestInitGossipService(t *testing.T) {
 			assert.Equal(t, gossip, GetGossipService())
 		}(gossip)
 	}
+
+	time.Sleep(time.Second * 2)
 }
 
 // Make sure *joinChannelMessage implements the api.JoinChannelMessage