lntest/itest: add session deletion itest

itest/list_on_test.go

@@ -515,4 +515,8 @@ var allTestCases = []*lntest.TestCase{
 		Name:     "lookup htlc resolution",
 		TestFunc: testLookupHtlcResolution,
 	},
+	{
+		Name:     "watchtower session management",
+		TestFunc: testWatchtowerSessionManagement,
+	},
 }