build: update to latest versions of neutrino+btcwallet

In this commit, we update to the latest versions of btcwallet+neutrino
that fix a number of bugs within lnd itself. Namely, we ensure that we
no longer print out garbage bytes, properly reconnect btcd after being
disconnected, ensure we don't add duplicate utxos, and finally ensure
that we always start the rescan from the wallet's initial birthday.

Fixes #1775.
Fixes #1494.
Fixes #444.

Gopkg.lock

@@ -107,7 +107,7 @@
   revision = "ab6388e0c60ae4834a1f57511e20c17b5f78be4b"
 
 [[projects]]
-  digest = "1:b6aad1b935c1e7c6cb6be7ecb65288de11e0df0d6224d757816e40009ec52a2c"
+  digest = "1:989454089255d33be696e7ae9d201d436c91a3d17856c7a84e7e02a64da61b91"
   name = "github.com/btcsuite/btcwallet"
   packages = [
     "chain",
@@ -127,7 +127,7 @@
     "wtxmgr",
   ]
   pruneopts = "UT"
-  revision = "7b84dc25a61634c450d21ec7f47d5e916eb88fdb"
+  revision = "8ae4afc70174bacc745e8dd89fc6db2d817909bd"
 
 [[projects]]
   branch = "master"
@@ -266,7 +266,7 @@
   revision = "462a8a75388506b68f76661af8d649f0b88e5301"
 
 [[projects]]
-  digest = "1:17f1db965adb240de22a1662b4b712858ae767fe7da94ffd4e321b4dcb4bd553"
+  digest = "1:8d52bdba5fb92865f3ad4b9cd6ed48a03bbf2aaf2d4d190acaf54cd7b65bd7bd"
   name = "github.com/lightninglabs/neutrino"
   packages = [
     ".",
@@ -277,7 +277,7 @@
     "headerlist",
   ]
   pruneopts = "UT"
-  revision = "166fe699d5964581d24e6bfff0aa329cfb6a8bc9"
+  revision = "e7780d39ef5628b23615a6cbbb2f41cd583f4afd"
 
 [[projects]]
   digest = "1:58ab6d6525898cbeb86dc29a68f8e9bfe95254b9032134eb9458779574872260"

Gopkg.toml

@@ -40,7 +40,7 @@
 
 [[constraint]]
   name = "github.com/lightninglabs/neutrino"
-  revision = "166fe699d5964581d24e6bfff0aa329cfb6a8bc9"
+  revision = "e7780d39ef5628b23615a6cbbb2f41cd583f4afd"
 
 [[constraint]]
   name = "github.com/lightningnetwork/lightning-onion"
@@ -68,7 +68,7 @@
 
 [[constraint]]
   name = "github.com/btcsuite/btcwallet"
-  revision = "7b84dc25a61634c450d21ec7f47d5e916eb88fdb"
+  revision = "8ae4afc70174bacc745e8dd89fc6db2d817909bd"
 
 [[constraint]]
   name = "github.com/tv42/zbase32"