bitbake: bitbake: tests/data: add test for incorrect remove behaviour

bitbake: bitbake: tests/data: add test for incorrect remove behaviour

The _remove operator isn't working correctly when used with a variable that
expands to several items, so add a test case to exercise this path.

(Bitbake rev: cb2a62a5fbffb358528a85b46c1fc6383286cb9d)

(Bitbake rev: ed950f95fc80f069e800e9c6e785641f307e6512)

Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Signed-off-by: Armin Kuster <akuster808@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>