clear_log is used as a fixture by pytest. We need to be able to call
it from the code level. Example of use in the file
test_harwaremap.py line 157.
Signed-off-by: Paszkiet Kamil <kamilx.paszkiet@intel.com>
Current blacbox tests leave two folders,
OUT_DIR and TEST_DIR after they are finished.
Unit tests create two further folders,
mock_testsuite and demo_board_2.
This change deletes them appropriately.
Additionally, the created twister-out* folders in blackbox tests are
moved to a temp directory and removed after every test.
Signed-off-by: Lukasz Mrugala <lukaszx.mrugala@intel.com>