Attempt to fix timeout flake

Signed-off-by: Chun-Hung Tseng <henrytseng@google.com>

Author: henrybear327

tests/e2e/cluster_downgrade_test.go

@@ -190,17 +190,18 @@ func testDowngradeUpgrade(t *testing.T, numberOfMembersToDowngrade int, clusterS
 	assert.Equal(t, beforeKV.Kvs, afterKV.Kvs)
 	assert.Equal(t, beforeMembers.Members, afterMembers.Members)
 
-	if len(epc.Procs) > 1 {
-		t.Log("Waiting health interval to required to make membership changes")
-		time.Sleep(etcdserver.HealthInterval)
-	}
-
 	if triggerCancellation == cancelAfterDowngrading {
+		time.Sleep(1 * time.Second)
 		e2e.DowngradeCancel(t, epc)
 		t.Log("Downgrade cancelled, validating if cluster is in the right state")
 		e2e.ValidateMemberVersions(t, epc, generatePartialCancellationVersions(clusterSize, membersToChange, lastClusterVersion))
 	}
 
+	if len(epc.Procs) > 1 {
+		t.Log("Waiting health interval to required to make membership changes")
+		time.Sleep(etcdserver.HealthInterval)
+	}
+
 	t.Log("Adding learner to test membership, but avoid breaking quorum")
 	resp, err = cc.MemberAddAsLearner(context.Background(), "fake2", []string{"http://127.0.0.1:1002"})
 	require.NoError(t, err)