os/bluestore: limit error/warning lines shown during fsck.

os/bluestore: limit error/warning lines shown during fsck.

Some 'expected' fsck falures (e.g. legacy omap records from previous
releases in Octopus) might produce tons of corresponding error/warning log lines.
This is a simple and rough workaround which limits number of printed lines by a
predefined value of 100.
Curretly applied to omap-related errors only.

Known flaw is that limit is applied on per-task basis hence multi-threaded quick-fix will
prooduce up to 100 * <number of fix task> lines instead of 100 which is a bit confusing.

Signed-off-by: Igor Fedotov <ifedotov@suse.com>