btrfs: Refactor clustered extent allocation into find_free_extent_clustered

We have two main methods to find free extents inside a block group:

1) clustered allocation
2) unclustered allocation

This patch will extract the clustered allocation into
find_free_extent_clustered() to make it a little easier to read.

Instead of jumping between different labels in find_free_extent(), the
helper function will use return value to indicate different behavior.

Signed-off-by: Qu Wenruo <[email protected]>
Reviewed-by: Su Yue <[email protected]>
Reviewed-by: Josef Bacik <[email protected]>
Signed-off-by: David Sterba <[email protected]>

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