Allow multiple etcd host

[bitbandi]

Change Description

This patch allow set multiple etcd servers. like an etcd cluster in docker swarm/kubernetes.

Steps to Test

./lnd-debug \
   --db.backend=etcd \
   --db.etcd.host=etcd1:2379,etcd2:2379 \

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[yyforyongyu]

Thank you for the PR!

Please refer to our contribution guidelines on how to create commit messages.

This will also need a release note.

[bitbandi]

Signed the commit. i dont know what to write to release note.

[guggero]

Can be something simple, like "Allow multiple etcd hosts to be specified in db.etcd.host."
The important thing is that you link to this PR in the release notes, which makes that specific check in the CI green.

[guggero]

Thanks for the PR!

The changes here are made in a Golang submodule (kvdb, see go.mod), which means this will need another PR that updates the submodule in the main go.mod file.
This can't be done in the same PR, mostly just FYI.

So this looks good to me once we update the configuration description (so users know this is a feature).

[lightninglabs-deploy]

@bitbandi, remember to re-request review from reviewers when ready

[yyforyongyu]

LGTM, thanks for the fix!

[bitbandi]

conflict resolved