btrfs: use the key format macros when printing keys

btrfs: use the key format macros when printing keys

Change all locations that print a key to use the new macros to print
them in order to ensure a consistent style and avoid repetitive code.

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