Adds test cases for SPDX 3.0. Reworks the SPDX 2.2 test setup so it can
also be run even if the default is SPDX 3.0
(From OE-Core rev: b1d2309b3ab0fd8b0d8c4dfa59f50c85074bbd3b)
Signed-off-by: Joshua Watt <JPEWhacker@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>