Better tests options: Timeout, good-EOF

[tomhea]

Add the next options in both assemble_and_run_test_output() and run_test_output():

• Timeout - the test will finish at the requested moment, with the new TerminationCause.Timeout.
• Allow getting test success (i.e. no asserts) on some failures - by allowing whitelisting a list of TerminationCauses that won't fail the test (in that case, a test will fail only if its current output is different from the expected output.