[FAB-1781] Fix failing test in multichain package

https://jira.hyperledger.org/browse/FAB-1781

Changesets [1] and [2] got merged and as a result a test in the
`multichain` package fails.

This changeset fixes the failing test.

[1] https://gerrit.hyperledger.org/r/3867
[2] https://gerrit.hyperledger.org/r/4581

Change-Id: I2dfc6403f79914943107a77b587791800ac053eb
Signed-off-by: Kostas Christidis <kostas@christidis.io>

orderer/multichain/manager_test.go

@@ -115,7 +115,7 @@ func TestNoSystemChain(t *testing.T) {
 	consenters := make(map[string]Consenter)
 	consenters[conf.Genesis.OrdererType] = &mockConsenter{}
 
-	NewManagerImpl(lf, consenters)
+	NewManagerImpl(lf, consenters, &xxxCryptoHelper{})
 }
 
 // This test essentially brings the entire system up and is ultimately what main.go will replicate