ceph-for-4.20-rc1

The highlights are:

- a series that fixes some old memory allocation issues in libceph
  (myself).  We no longer allocate memory in places where allocation
  failures cannot be handled and BUG when the allocation fails.

- support for copy_file_range() syscall (Luis Henriques).  If size and
  alignment conditions are met, it leverages RADOS copy-from operation.
  Otherwise, a local copy is performed.

- a patch that reduces memory requirement of ceph_sync_read() from the
  size of the entire read to the size of one object (Zheng Yan).

- fallocate() syscall is now restricted to FALLOC_FL_PUNCH_HOLE (Luis
  Henriques)
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