build: update to lnd 0.17.0

[Roasbeef]

The latest version of btcd had an API change that we adapt to in our logic for merkle tree verification.

[guggero]

LGTM 🎉

[guggero]

Did the same bump in all other projects to prepare, noticed two things that we need to bump to propagate to litd in the end.

[guggero]

The unknown database backend is coming from Aperture, due to the version bump. Just need to apply the following diff:

diff --git a/itest/aperture_harness.go b/itest/aperture_harness.go
index df341aea..95500363 100644
--- a/itest/aperture_harness.go
+++ b/itest/aperture_harness.go
@@ -42,7 +42,8 @@ func NewApertureHarness(t *testing.T, port int) ApertureHarness {
                Authenticator: &aperture.AuthConfig{
                        Disable: true,
                },
-               Etcd: &aperture.EtcdConfig{},
+               DatabaseBackend: "sqlite",
+               Sqlite:          aperture.DefaultSqliteConfig(),
                HashMail: &aperture.HashMailConfig{
                        Enabled:               true,
                        MessageRate:           time.Millisecond,