Ceph 0.87.2 Giant 发布分布式文件系统

Ceph 0.87.2 Giant 发布，此版本主要更新信息如下：

ceph-objectstore-tool: only output unsupported features when incompatible (#11176 David Zafman)
common: do not implicitly unlock rwlock on destruction (Federico Simoncelli)
common: make wait timeout on empty queue configurable (#10818 Samuel Just)
crush: pick ruleset id that matches and rule id (Xiaoxi Chen)
crush: set_choose_tries = 100 for new erasure code rulesets (#10353 Loic Dachary)
librados: check initialized atomic safely (#9617 Josh Durgin)
librados: fix failed tick_event assert (#11183 Zhiqiang Wang)
librados: fix looping on skipped maps (#9986 Ding Dinghua)
librados: fix op submit with timeout (#10340 Samuel Just)
librados: pybind: fix memory leak (#10723 Billy Olsen)
librados: pybind: keep reference to callbacks (#10775 Josh Durgin)
librados: translate operation flags from C APIs (Matthew Richards)
libradosstriper: fix write_full on ENOENT (#10758 Sebastien Ponce)
libradosstriper: use strtoll instead of strtol (Dongmao Zhang)
mds: fix assertion caused by system time moving backwards (#11053 Yan, Zheng)
4mon: allow injection of random delays on writes (Joao Eduardo Luis)
mon: do not trust small osd epoch cache values (#10787 Sage Weil)
mon: fail non-blocking flush if object is being scrubbed (#8011 Samuel Just)
mon: fix division by zero in stats dump (Joao Eduardo Luis)
mon: fix get_rule_avail when no osds (#10257 Joao Eduardo Luis)
mon: fix timeout rounds period (#10546 Joao Eduardo Luis)
mon: ignore osd failures before up_from (#10762 Dan van der Ster, Sage Weil)