btrfs-progs: Introduce function to find next sibling tree block

Introduce a new function, btrfs_next_sibling_tree_block(), which could
find any sibling tree blocks at path->lowest_level, unlike level 0
limited btrfs_next_leaf().

Since this function is more generic than btrfs_next_leaf(), also make
btrfs_next_leaf() a wrapper of btrfs_next_sibling_tree_block(), to keep
the interface the same as kernel.

This would provide the basis for later breadth-first search print-tree.

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

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