Close the consumer master in tests

Since it now owns the client, we leave goroutines hanging around if we don't.

consumer_test.go

@@ -47,6 +47,7 @@ func TestConsumerOffsetManual(t *testing.T) {
 	}
 
 	safeClose(t, consumer)
+	safeClose(t, master)
 	leader.Close()
 }
 
@@ -80,6 +81,7 @@ func TestConsumerLatestOffset(t *testing.T) {
 
 	leader.Close()
 	safeClose(t, consumer)
+	safeClose(t, master)
 
 	// we deliver one message, so it should be one higher than we return in the OffsetResponse
 	if consumer.(*partitionConsumer).offset != 0x010102 {
@@ -126,6 +128,7 @@ func TestConsumerFunnyOffsets(t *testing.T) {
 	leader.Close()
 	seedBroker.Close()
 	safeClose(t, consumer)
+	safeClose(t, master)
 }
 
 func TestConsumerRebalancingMultiplePartitions(t *testing.T) {
@@ -248,6 +251,7 @@ func TestConsumerRebalancingMultiplePartitions(t *testing.T) {
 	leader1.Close()
 	leader0.Close()
 	seedBroker.Close()
+	safeClose(t, master)
 }
 
 func TestConsumerInterleavedClose(t *testing.T) {
@@ -288,6 +292,7 @@ func TestConsumerInterleavedClose(t *testing.T) {
 
 	safeClose(t, c1)
 	safeClose(t, c0)
+	safeClose(t, master)
 	leader.Close()
 	seedBroker.Close()
 }