Merge pull request #1937 from yuyuyu101/keyvaluestore-strip-size

Add strip size and set_alloc_hint op support for KeyValueStore

Reviewed-by: Sage Weil <sage@inktank.com>

diff --cc src/common/config_opts.h
Simple merge

diff --cc src/os/KeyValueStore.cc
Simple merge

diff --cc src/os/KeyValueStore.h
Simple merge

diff --cc src/test/objectstore/store_test.cc
Simple merge