scrub clears inconsistent flag set by deep scrub

Add new num_deep_scrub_errors to object_stat_sum_t
Show deep-scrub error count when outputing regular scrub errors
For now do deep-scrub after repair (see #4783)

fixes: #4778
Signed-off-by: David Zafman <david.zafman@inktank.com>
scrub clears inconsistent flag set by deep scrub (improvements)

Track shallow and deep scrub errors independently
Remove code related to unused inconsistent_snapcolls

fixes: #4778
Signed-off-by: David Zafman <david.zafman@inktank.com>