itest: remove unnecessary channel close and node shutdown

Since we don't have standby nodes anymore, we don't need to close the
channels when the test finishes. Previously we would do so to make sure
the standby nodes have a clean state for the next test case, which is no
longer relevant.

itest/lnd_channel_graph_test.go

@@ -234,7 +234,7 @@ func testUnannouncedChannels(ht *lntest.HarnessTest) {
 
 	// One block is enough to make the channel ready for use, since the
 	// nodes have defaultNumConfs=1 set.
-	fundingChanPoint := ht.WaitForChannelOpenEvent(chanOpenUpdate)
+	ht.WaitForChannelOpenEvent(chanOpenUpdate)
 
 	// Alice should have 1 edge in her graph.
 	ht.AssertNumActiveEdges(alice, 1, true)
@@ -248,9 +248,6 @@ func testUnannouncedChannels(ht *lntest.HarnessTest) {
 
 	// Give the network a chance to learn that auth proof is confirmed.
 	ht.AssertNumActiveEdges(alice, 1, false)
-
-	// Close the channel used during the test.
-	ht.CloseChannel(alice, fundingChanPoint)
 }
 
 func testGraphTopologyNotifications(ht *lntest.HarnessTest) {
@@ -367,9 +364,6 @@ func testGraphTopologyNtfns(ht *lntest.HarnessTest, pinned bool) {
 	// Bob's new node announcement, and the channel between Bob and Carol.
 	ht.AssertNumChannelUpdates(alice, chanPoint, 2)
 	ht.AssertNumNodeAnns(alice, bob.PubKeyStr, 1)
-
-	// Close the channel between Bob and Carol.
-	ht.CloseChannel(bob, chanPoint)
 }
 
 // testNodeAnnouncement ensures that when a node is started with one or more
@@ -402,7 +396,7 @@ func testNodeAnnouncement(ht *lntest.HarnessTest) {
 	// We'll then go ahead and open a channel between Bob and Dave. This
 	// ensures that Alice receives the node announcement from Bob as part of
 	// the announcement broadcast.
-	chanPoint := ht.OpenChannel(
+	ht.OpenChannel(
 		bob, dave, lntest.OpenChannelParams{Amt: 1000000},
 	)
 
@@ -424,9 +418,6 @@ func testNodeAnnouncement(ht *lntest.HarnessTest) {
 	allUpdates := ht.AssertNumNodeAnns(alice, dave.PubKeyStr, 1)
 	nodeUpdate := allUpdates[len(allUpdates)-1]
 	assertAddrs(nodeUpdate.Addresses, advertisedAddrs...)
-
-	// Close the channel between Bob and Dave.
-	ht.CloseChannel(bob, chanPoint)
 }
 
 // testUpdateNodeAnnouncement ensures that the RPC endpoint validates
@@ -531,7 +522,7 @@ func testUpdateNodeAnnouncement(ht *lntest.HarnessTest) {
 	// Go ahead and open a channel between Bob and Dave. This
 	// ensures that Alice receives the node announcement from Bob as part of
 	// the announcement broadcast.
-	chanPoint := ht.OpenChannel(
+	ht.OpenChannel(
 		bob, dave, lntest.OpenChannelParams{
 			Amt: 1000000,
 		},
@@ -661,9 +652,6 @@ func testUpdateNodeAnnouncement(ht *lntest.HarnessTest) {
 		FeatureUpdates: updateFeatureActions,
 	}
 	dave.RPC.UpdateNodeAnnouncementErr(nodeAnnReq)
-
-	// Close the channel between Bob and Dave.
-	ht.CloseChannel(bob, chanPoint)
 }
 
 // assertSyncType asserts that the peer has an expected syncType.