Revert "Extend test timeout to 10 seconds."

This reverts commit 5e1a004.

Author: menghanl

balancer/grpclb/grpclb_test.go

@@ -661,7 +661,7 @@ func TestBalancerDisconnects(t *testing.T) {
 	lbs[0].Stop()
 	// Stop balancer[0], balancer[1] should be used by grpclb.
 	// Check peer address to see if that happened.
-	for i := 0; i < 10000; i++ {
+	for i := 0; i < 1000; i++ {
 		if _, err := testC.EmptyCall(context.Background(), &testpb.Empty{}, grpc.WaitForReady(true), grpc.Peer(&p)); err != nil {
 			t.Fatalf("%v.EmptyCall(_, _) = _, %v, want _, <nil>", testC, err)
 		}
@@ -670,7 +670,7 @@ func TestBalancerDisconnects(t *testing.T) {
 		}
 		time.Sleep(time.Millisecond)
 	}
-	t.Fatalf("No RPC sent to second backend after 10 second")
+	t.Fatalf("No RPC sent to second backend after 1 second")
 }
 
 func TestFallback(t *testing.T) {