Skip long node tests in -short mode

I added checks against testing.Short for tests that took longer than
about one second on my machine. Running with -short reduces the test
time of node from about 7.7s to about 0.9s.

The difference is much more pronounced with the race detector enabled,
about 33s without -short and about 1.4s with -short.

node/node_test.go

@@ -106,6 +106,10 @@ func getTestNode(ctx context.Context, t *testing.T, conf *config.Config, logger
 }
 
 func TestNodeDelayedStart(t *testing.T) {
+	if testing.Short() {
+		t.Skip("skipping test in short mode")
+	}
+
 	cfg, err := config.ResetTestRoot(t.TempDir(), "node_delayed_start_test")
 	require.NoError(t, err)
 
@@ -195,6 +199,10 @@ func TestNodeSetPrivValTCP(t *testing.T) {
 
 // address without a protocol must result in error
 func TestPrivValidatorListenAddrNoProtocol(t *testing.T) {
+	if testing.Short() {
+		t.Skip("skipping test in short mode")
+	}
+
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()
 
@@ -441,6 +449,10 @@ func TestMaxTxsProposalBlockSize(t *testing.T) {
 }
 
 func TestMaxProposalBlockSize(t *testing.T) {
+	if testing.Short() {
+		t.Skip("skipping test in short mode")
+	}
+
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()