lnwallet: extend Reservation with alias chan-type, feature-bit flags

This extends the Reservation arguments to include whether a pending
channel open has negotiated the zero-conf channel type, the scid-alias
channel type, and/or the scid-alias feature bit. The result of those
negotiates are stored in the OpenChannel's ChanType. The arguments to
NewChannelReservation have also been simplified.

lnwallet/test/test_interface.go

@@ -728,11 +728,17 @@ func testCancelNonExistentReservation(miner *rpctest.Harness,
 	feePerKw, err := alice.Cfg.FeeEstimator.EstimateFeePerKW(1)
 	require.NoError(t, err, "unable to query fee estimator")
 
+	req := &lnwallet.InitFundingReserveMsg{
+		CommitFeePerKw: feePerKw,
+		PushMSat:       10,
+		Flags:          lnwire.FFAnnounceChannel,
+		CommitType:     lnwallet.CommitmentTypeTweakless,
+		PendingChanID:  [32]byte{},
+	}
+
 	// Create our own reservation, give it some ID.
 	res, err := lnwallet.NewChannelReservation(
-		10000, 10000, feePerKw, alice, 22, 10, &testHdSeed,
-		lnwire.FFAnnounceChannel, lnwallet.CommitmentTypeTweakless,
-		nil, [32]byte{}, 0,
+		10000, 10000, alice, 22, &testHdSeed, 0, req,
 	)
 	require.NoError(t, err, "unable to create res")