adding pings for the secondary nodes as well, the sleep worked, somet…

…hing is off with the initial connection state

integration-tests/fault-injection/harness/mongo.go

@@ -131,7 +131,12 @@ func (server *MongoServer) Client() *mongo.Client {
 
 	err = client.Ping(ctx, readpref.Primary())
 	if err != nil {
-		panic("Error pinging Mongo")
+		panic("Error pinging primary Mongo for read")
+	}
+
+	err = client.Ping(ctx, readpref.Secondary())
+	if err != nil {
+		panic("Error pinging secondary Mongo for read")
 	}
 
 	return client