Revert [AIRFLOW-2814] - Change min_file_process_interval to 0

[kaxil]

Make sure you have checked all steps below.

JIRA

• My PR addresses the following Airflow JIRA issues and references them in the PR title. For example, "[AIRFLOW-XXX] My Airflow PR"
  • https://issues.apache.org/jira/browse/AIRFLOW-2814
  • In case you are fixing a typo in the documentation you can prepend your commit with [AIRFLOW-XXX], code changes always need a JIRA issue.

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Tests

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Commits

• My commits all reference JIRA issues in their subject lines, and I have squashed multiple commits if they address the same issue. In addition, my commits follow the guidelines from "How to write a good git commit message":
  1. Subject is separated from body by a blank line
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  4. Subject uses the imperative mood ("add", not "adding")
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Documentation

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Code Quality

• Passes git diff upstream/master -u -- "*.py" | flake8 --diff

[kaxil]

@Fokko PTAL. Also, shouldn't we be reducing dag_dir_list_interval as well? It is 5 mins by default.

[XD-DENG]

Hi @kaxil , please be reminded to update the comment in
https://github.com/apache/incubator-airflow/blob/master/airflow/jobs.py#L592 as well, otherwise the comment will be inconsistent with the configuration value again.

[codecov-io]

Codecov Report

Merging #3669 into master will increase coverage by 0.27%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3669      +/-   ##
==========================================
+ Coverage   77.51%   77.79%   +0.27%     
==========================================
  Files         205      205              
  Lines       15751    16079     +328     
==========================================
+ Hits        12210    12508     +298     
- Misses       3541     3571      +30

Impacted Files	Coverage Δ
airflow/jobs.py	84.63% <ø> (+1.88%)	⬆️
airflow/utils/dag_processing.py	89.45% <0%> (-0.43%)	⬇️

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[kaxil]

@Fokko @feng-tao Can you please take a look?

[feng-tao]

@kaxil , lgtm

[kaxil]

This revert was based in discussion at #3659