[FAB-3328] fix couchdb unit test failures

A stale changeset got merged:
https://gerrit.hyperledger.org/r/#/c/7975/
containing code that was incompatible with more recent merges.

This changeset fixes it.

Change-Id: I5de7054c6967d8b3cc791e5916c1d0cf8ffb9cde
Signed-off-by: denyeart <enyeart@us.ibm.com>

core/ledger/util/couchdb/couchdbutil_test.go

@@ -51,8 +51,9 @@ func TestCreateCouchDBSystemDBs(t *testing.T) {
 		defer cleanup(database)
 
 		//create a new connection
-		couchInstance, err := CreateCouchInstance(connectURL, "", "", maxRetries,
-			maxRetriesOnStartup, requestTimeout)
+		couchInstance, err := CreateCouchInstance(couchDBDef.URL, couchDBDef.Username, couchDBDef.Password,
+			couchDBDef.MaxRetries, couchDBDef.MaxRetriesOnStartup, couchDBDef.RequestTimeout)
+
 		testutil.AssertNoError(t, err, fmt.Sprintf("Error when trying to CreateCouchInstance"))
 
 		err = CreateSystemDatabasesIfNotExist(*couchInstance)