ceph-for-5.11-rc1

The big ticket item here is support for msgr2 on-wire protocol, which
adds the option of full in-transit encryption using AES-GCM algorithm
(myself).  On top of that we have a series to avoid intermittent
errors during recovery with recover_session=clean and some MDS request
encoding work from Jeff, a cap handling fix and assorted observability
improvements from Luis and Xiubo and a good number of cleanups.  Luis
also ran into a corner case with quotas which sadly means that we are
back to denying cross-quota-realm renames.
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