in_exec: fix a file descriptor leaks #3634
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Which issue(s) this PR fixes:
Follow up #3627
What this PR does / why we need it:
Every calling command from in_exec plugin, it causes
a file descriptor leak.
If interval is short enough or running Fluentd in long term,
it will reaches the limit of file descriptor - "too many open files".
In this commit, ensure to close IO object when it reaches EOF.
Docs Changes:
N/A
Release Note:
N/A