As specified by git submodule manual relative urls can start either
with '..' or './', second case was incorrectly managed leading to an
interpretation of urls starting with './' as absoulte urls.
(Bitbake rev: 4a0bd3bcd1f7fc25364df8bbf185ff64881c015b)
Signed-off-by: Gennaro Iorio <gennaro.iorio@schindler.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>