Andrew Naoum 0f161c5033 channeldb+lnrpc: store the payment pre-image not rhash ...

Fixes #481.

Prior to this commit, payments stored in the channel DB only kept a
record of the payment hash. This is a problem as the preimage is what
serves as proof of payment and a user should be able to look up this
value in the future (not just immediately after payment).

Instead of storing both the payment hash and the preimage, we store the
preimage only since the hash can be derrived from this using a SHA256.

In the RPC listpayments command, we now give the preimage in addition to
the payment hash.

2018-01-27 18:36:33 -08:00

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