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530059f18b
In this commit, we move to start rejecting any normal payments that aren't keysend, if they don't also include the MPP invoice payload. With this change, we require that some sort of e2e secret (either the payment addr or the keysend pre-image) is present in a payload before we'll accept the payment. The second portion of the commit also updates all current tests in the package. We kept the base `TestSettleInvoice` test in-tact as it still exercises some useful behavior. However, we've removed all cases that allow an overpayment, as the new MPP logic doesn't allow overpayment for various reasons. In addition to this, some of the returned errors are slightly different, tho the actual behavior is equivalent.