lnd send announcement_signatures before funding_locked

[nayuta-ueno]

Ptarmigan spoil lnd's announcement_signatures before funding_locked.

• lnd: a575b5679d116fcadb0f5b8dd943953e11646de4

BOLT7:

A recipient node:
  - if it has not sent funding_locked:
    - MAY defer handling the announcement_signatures until after it has sent funding_locked
    - otherwise:
      - MUST ignore it.

[nayuta-ueno]

https://github.com/lightningnetwork/lightning-rfc/pull/625

[nayuta-ueno]

https://github.com/lightningnetwork/lightning-rfc/pull/620