Set longMessage to True for all tests derived from oeRuntimeTest, in
order to have somewhat info on assertions with cryptic or no messages.
(From OE-Core rev: e5196ebd6c652431a3b80cdc9f60b752401314f4)
Signed-off-by: Mihai Lindner <mihaix.lindner@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>