service: add func for string config change check
authorYousong Zhou <yszhou4tech@gmail.com>
Sun, 11 Feb 2018 09:17:08 +0000 (17:17 +0800)
committerYousong Zhou <yszhou4tech@gmail.com>
Wed, 28 Mar 2018 09:29:49 +0000 (17:29 +0800)
To also prepare for following commits introducing more string value
change detection

Signed-off-by: Yousong Zhou <yszhou4tech@gmail.com>

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