btrfs: do not batch insert non-consecutive dir indexes during log replay

While running generic/475 in a loop I got the following error

BTRFS critical (device dm-11): corrupt leaf: root=5 block=31096832 slot=69, bad key order, prev (263 96 531) current (263 96 524)
<snip>
 item 65 key (263 96 517) itemoff 14132 itemsize 33
 item 66 key (263 96 523) itemoff 14099 itemsize 33
 item 67 key (263 96 525) itemoff 14066 itemsize 33
 item 68 key (263 96 531) itemoff 14033 itemsize 33
 item 69 key (263 96 524) itemoff 14000 itemsize 33

As you can see here we have 3 dir index keys with the dir index value of
523, 524, and 525 inserted between 517 and 524.  This occurs because our
dir index insertion code will bulk insert all dir index items on the
node regardless of their actual key value.

This makes sense on a normally running system, because if there's a gap
in between the items there was a deletion before the item was inserted,
so there's not going to be an overlap of the dir index items that need
to be inserted and what exists on disk.

However during log replay this isn't necessarily true, we could have any
number of dir indexes in the tree already.

Fix this by seeing if we're replaying the log, and if we are simply skip
batching if there's a gap in the key space.

This file system was left broken from the fstest, I tested this patch
against the broken fs to make sure it replayed the log properly, and
then btrfs checked the file system after the log replay to verify
everything was ok.

Reviewed-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: Sweet Tea Dorminy <sweettea-kernel@dorminy.me>
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: David Sterba <dsterba@suse.com>