testexport.bbclass oe-test: capture all tests and data from all layers

testexport.bbclass oe-test: capture all tests and data from all layers

testexport.bbclass only copied files from core layer to
the testexport.tar.gz to run tests. Then it filtered
out tests and files which were not specified in
TEST_SUITES variable.

Remove filtering of files to include parselogs.py
test data files which are machine and/or layer specific.
TEST_SUITES variable is now read from build time exported
data store when running tests so there is no need to remove
files from exported tests in testexport.bbclass.

Adapt oe-test script to find "lib" directories from
the new structure with layer specific paths which are
used to find tests and test data files.

Signed-off-by: Mikko Rapeli <mikko.rapeli@linaro.org>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>