Yi Wu d6ae6dec69 Add Statistics::getAndResetTickerCount().
Summary: A convience method to atomically get and reset ticker count. I'm wanting to use it to have a thin wrapper to the statistics object to export ticker counts to ODS for LogDevice (since they don't even use fb303).

Test Plan:
test in LogDevice shadow cluster.
https://fburl.com/461868822

Reviewers: andrewkr, yhchiang, IslamAbdelRahman

Reviewed By: IslamAbdelRahman

Subscribers: andrewkr, dhruba, leveldb

Differential Revision: https://reviews.facebook.net/D64869
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