Backport Fix-inconsistent-use-of-tabs-vs.-space.patch to make it can be
built by python3.
(From OE-Core rev: c488656825accf4543754cb712256a775d5a92e7)
Signed-off-by: Robert Yang <liezhi.yang@windriver.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>