ceph-for-5.8-rc1

The highlights are:

- OSD/MDS latency and caps cache metrics infrastructure for the
  filesytem (Xiubo Li).  Currently available through debugfs and
  will be periodically sent to the MDS in the future.

- support for replica reads (balanced and localized reads) for
  rbd and the filesystem (myself).  The default remains to always
  read from primary, users can opt-in with the new crush_location
  and read_from_replica options.  Note that reading from replica
  is safe for general use only since Octopus.

- support for RADOS allocation hint flags (myself).  Currently
  used by rbd to propagate the compressible/incompressible hint
  given with the new compression_hint map option and ready for
  passing on more advanced hints, e.g. based on fadvise() from
  the filesystem.

- support for efficient cross-quota-realm renames (Luis Henriques)

- assorted cap handling improvements and cleanups, particularly
  untangling some of the locking (Jeff Layton)
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