Function which calls cooker's unlock method, which in turn unlocks bitbake.lock
file.
(Bitbake rev: e97a9f1528d77503b5c93e48e3de9933fbb9f3cd)
Signed-off-by: Leonardo Sandoval <leonardo.sandoval.gonzalez@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>