lightning: better estimate of the max-open-files (#1414)

[ti-chi-bot]

This is an automated cherry-pick of #1414

What problem does this PR solve?

Make better estimate of the max-open-files by also take import routines into account.

What is changed and how it works?

Check List

Tests

• Unit test

Code changes

Side effects

Related changes

• Need to cherry-pick to the release branch
• Need to update the documentation

Release note

• No release note

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• glorv
• kennytm

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[glorv]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: a0f85a4

[glorv]

/run-all-tests

[zhouqiang-cl]

/merge

[ti-chi-bot]

@zhouqiang-cl: /merge is only allowed for the committers, you can assign this pull request to the committer in list by filling /assign @committer in the comment to help merge this pull request.

In response to this:

/merge

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[ti-chi-bot]

@ti-chi-bot: Your PR was out of date, I have automatically updated it for you.

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