tests: use generic function from test-lib where possible

[zmiklank]

• the run_all_tests and handle_test_case_result functions removed, as their functionality is contained in ct_run_tests_from_testset and ct_cleanup functions
• wait_for_cid removed and used the one from test-lib.sh
• cleanup function called at EXIT and SIGINT together with ct_cleanup function. ct_cleanup partially takes over local cleanup responsibility, as it cleans containers and CIDs in $CID_FILE_DIR
• test_from_dockerfile split to 2 functions, as the ct_run_all_tests_from_testset does not allow parametrized tests

[zmiklank]

[test-all]