Ceph recovery limits

These are the essentials for keeping a cluster working while doing backfill / recovery.

ceph tell osd.* injectargs '--osd_recovery_op_priority 1'
ceph tell osd.* injectargs '--osd_max_backfills 1'
ceph tell osd.* injectargs '--osd-recovery-max-active 1'
ceph tell osd.* injectargs '--osd-max-recovery-threads 1'
ceph tell osd.* injectargs '--osd-client-op-priority 63'

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