btrfs: scrub: introduce a helper to verify one metadata block

The new helper, scrub_verify_one_metadata(), is almost the same as
scrub_checksum_tree_block().

The difference is in how we grab the pages from other structures.

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