get_layer_revisions() uses the os.path module but it is not included
in the imports.
(From OE-Core rev: a888d56d46b01d6126179e3f38e3c1739c38d45c)
Signed-off-by: Jermain Horsman <jermain.horsman@nedap.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
(cherry picked from commit 4339ef5b46c39cce402d1cc3526b39702837b839)
Signed-off-by: Steve Sakoman <steve@sakoman.com>