ceph-for-7.0-rc1

This adds support for the upcoming aes256k key type in CephX that is
based on Kerberos 5 and brings a bunch of assorted CephFS fixes from
Ethan and Sam.  One of Sam's patches in particular undoes a change in
the fscrypt area that had an inadvertent side effect of making CephFS
behave as if mounted with wsize=4096 and leading to the corresponding
degradation in performance, especially for sequential writes.
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