multi: Deprecate endpoints sendpayment, sendtoroute, sendtoroutesync, and sendpaymentsync

[mohamedawnallah]

Change Description

This pull request removes the deprecated endpoints sendpayment, sendtoroute, sendtoroutesync, and sendpaymentsync in lightning.proto, rpcserver.go, lntest/rpc/lnd.go, and its related test cases in itest/lnd_routing_test.go and itest/lnd_channel_policy_test.go.

Closes #8175

Steps to Test

I ran the test cases using make check to make sure there were no regressions and all the test cases passed.

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[mohamedawnallah]

Hey @yyforyongyu, to keep you updated all the test cases are passed in the Travis CI run. That said we need to double check on those assertions:

• lnd_channel_policy_test.go#L180 assertion
• lnd_channel_policy_test.go#L206 assertion
• lnd_routing_test.go#L402 assertion

[mohamedawnallah]

Hey, @yyforyongyu @guggero is there any way we can get this in? :)

[yyforyongyu]

@mohamedawnallah Thanks for the PR! As mentioned in the issue, we won't add this in the upcoming release so this will be marked as low priority atm.

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[mohamedawnallah]

Hi @yyforyongyu,

It seems that the LND v0.19 release is now on track, as I see in the LND projects dashboard. I've rebased onto the master branch and resolved the conflicts.

I would love to receive any feedback on that PR! 🙏

[yyforyongyu]

Thanks for keeping an eye on this! I'm thinking we can start noticing the users about the upcoming removal in 0.19.0, and then remove these dead endpoints in 0.20.0, but wanna hear more from @guggero and @saubyk.

[saubyk]

Thanks for keeping an eye on this! I'm thinking we can start noticing the users about the upcoming removal in 0.19.0, and then remove these dead endpoints in 0.20.0, but wanna hear more from @guggero and @saubyk.

+1 for notifying about the upcoming removal with 0.19 and removing in 0.20