ceph-for-5.13-rc1

Notable items here are a series to take advantage of David Howells'
netfs helper library from Jeff, three new filesystem client metrics
from Xiubo, ceph.dir.rsnaps vxattr from Yanhu and two auth-related
fixes from myself, marked for stable.  Interspersed is a smattering
of assorted fixes and cleanups across the filesystem.
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