lntest: fix edge assertion and reset min relay fee

[yyforyongyu]

Cherry-pick 2 6 commits from #9227 to fix the min relay fee and edge assertion issues.
Fixes

• [bug]: The batch_channel_funding and unannounced_channels itests cannot be run consecutively within the same tranche #9245

To test it, check out #8754, run before and after this PR and see the test results.

make itest icase='(unannounced_channels|batch_channel_funding)'

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[guggero]

Nice, LGTM 🎉

[ViktorTigerstrom]

tACK LGTM 🚀! Thanks a lot for this fix @yyforyongyu 🔥.

Leaving mostly a few questions here as I'm not fully familiar with this part of the code base yet.

[ViktorTigerstrom]

Hmmm just sanity checking here:
Is there no need to wait here for all acceptChannel(h.T, true, acceptor) in the goroutines to have finished executing before executing the cancels and returning from this function?

[yyforyongyu]

yeah the channel must be accepted by now, otherwise openChannelsForNodes will throw an assertion.