[kudu-CR] [util] switch to using std::shared lock

[Alexey Serbin (Code Review)]

Alexey Serbin has removed a vote on this change.

Change subject: [util] switch to using std::shared_lock
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Removed Verified-1 by Kudu Jenkins (120)
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Gerrit-Project: kudu
Gerrit-Branch: master
Gerrit-MessageType: deleteVote
Gerrit-Change-Id: Idcda724a3bdab86f593d0241e062dd40bcd26af1
Gerrit-Change-Number: 21349
Gerrit-PatchSet: 1
Gerrit-Owner: Alexey Serbin <ale...@apache.org>
Gerrit-Reviewer: Abhishek Chennaka <achenn...@cloudera.com>
Gerrit-Reviewer: Alexey Serbin <ale...@apache.org>
Gerrit-Reviewer: Kudu Jenkins (120)
Gerrit-Reviewer: Wang Xixu <1450306...@qq.com>