Small fixes in bash scripts and run_test.py

Signed-off-by: Andras Mitzki <mitzkia@gmail.com>
add message_generator class and unit test.

Signed-off-by: Andras Mitzki <mitzkia@gmail.com>
add message_sender class.

Signed-off-by: Andras Mitzki <mitzkia@gmail.com>
add test_reporter class.

Signed-off-by: Andras Mitzki <mitzkia@gmail.com>
small fixes in slng_process and setup_teardown.

Signed-off-by: Andras Mitzki <mitzkia@gmail.com>
add some small codes

Signed-off-by: Andras Mitzki <mitzkia@gmail.com>