Add shutil import to resolve error:
Exception: NameError: name 'shutil' is not defined, Did you forget to import 'shutil'
(From OE-Core rev: b64263a43b4d82f1ebba13815bccb8a8cd3127f9)
Signed-off-by: Mark Hatle <mark.hatle@kernel.crashing.org>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>