bugfix: Fix log-opt option parse fails if value contains comma #1729
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pflag.StringSliceVar will split the value into string array with
comma, instead pflag.StringArrayVar will pass the value as a whole
string, so we should use StringArrayVar if we intend to pass the
value into other component.
Ⅰ. Describe what this PR did
Ⅱ. Does this pull request fix one issue?
fix #1715
Ⅲ. Describe how you did it
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Ⅴ. Special notes for reviews