fluentd command: fix '--plugin'('-p') option not to overwrite default value #4605
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Which issue(s) this PR fixes:
What this PR does / why we need it:
This option is explained as "add plugin directory".
However, since v1.16.0, the behavior has changed to overwrite the default value unintentionally.
(PR: #4064, commit: 41678bf).
We should revert it to the original behavior.
Docs Changes:
Not needed.
Release Note:
The same as the title.