Make BCCSP stop complaining in gossip tests

BCCSP is logging the following message:
[BCCSP_FACTORY] GetDefault -> WARN 29a Before using BCCSP,\
 please call InitFactories(). Falling back to bootBCCSP.

If it is not initialized manually. Gossip uses BCCSP's hash
so when running the intensive gossip_test, there are lots of
BCCSP log entries logged.
I added a line that initializes the BCCSP to prevent this.

Change-Id: I1dd19794ced995f6cd3699d35aa138511267e9c4
Signed-off-by: Yacov Manevich <yacovm@il.ibm.com>

gossip/gossip/gossip_test.go

@@ -28,6 +28,7 @@ import (
 	"testing"
 	"time"
 
+	"github.com/hyperledger/fabric/bccsp/factory"
 	"github.com/hyperledger/fabric/gossip/api"
 	"github.com/hyperledger/fabric/gossip/comm"
 	"github.com/hyperledger/fabric/gossip/common"
@@ -49,9 +50,8 @@ func init() {
 	discovery.SetAliveExpirationCheckInterval(aliveTimeInterval)
 	discovery.SetAliveExpirationTimeout(aliveTimeInterval * 10)
 	discovery.SetReconnectInterval(aliveTimeInterval * 5)
-
 	testWG.Add(7)
-
+	factory.InitFactories(nil)
 }
 
 var orgInChannelA = api.OrgIdentityType("ORG1")