os/bluestore: Add health warning for bluestore fragmentation
Changed "bluestore/fragmentation_micros" from quick imprecise to
slow but more representative score.
Introduced config "bluestore_warn_on_free_fragmentation" that controls
when free space fragmentation score becomes a health warning.
Currently calculation of fragmentation score might be non-instant for
severly fragmented disks. It might induce stalls to write IO.
Config value "bluestore_fragmentation_check_period" control score
calculation period.
In future, costly score calculation will be replaced with method that
continously updates score.
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