btrfs: scrub: add cancel/pause/removed bg checks for raid56 parity stripes

For raid56, data and parity stripes are handled differently.

For data stripes they are handled just like regular RAID1/RAID10 stripes,
going through the regular scrub_simple_mirror().

But for parity stripes we have to read out all involved data stripes and
do any needed verification and repair, then scrub the parity stripe.

This process will take a much longer time than a regular stripe, but
unlike scrub_simple_mirror(), we do not check if we should cancel/pause
or the block group is already removed.

Aligned the behavior of scrub_raid56_parity_stripe() to
scrub_simple_mirror(), by adding:

- Cancel check
- Pause check
- Removed block group check

Since those checks are the same from the scrub_simple_mirror(), also
update the comments of scrub_simple_mirror() by:

- Remove too obvious comments
  We do not need extra comments on what we're checking, it's really too
  obvious.

- Remove a stale comment about pausing
  Now the scrub is always queuing all involved stripes, and submit them
  in one go, there is no more submission part during pausing.

Reviewed-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

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