gitsm.py: revise unpack

Greatly simply the unpack rule by copying the general functionality of
update_submodules as unpack_submodules.  This will recursively construct
a set of urls and unpack them using the standard system behaviors.

The overall code may be slightly bigger, but this ensures that all of the
standard locks are inplace, ensuring the code doesn't change out from
under the unpack function.  (This could have happened before due to using
'cp' instead of further unpacks on submodules.  This may still happen in
shallow clones.)

Signed-off-by: Mark Hatle <mark.hatle@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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