If timeout is reached without any information send fail with error.

This makes debugging much easier.

Instead of script being silent all the time provide results often, on
each try for runTestSuite.py.
Additionally print out full results of execution to the controlling
testnode, for better analysis.
in-vm-test script is adapted to follow such requirement.

Do not needlessly hide filename.

erp5testnode hardcoded timeout is 10 hours, and exceeding it results
with no-information.

This is required by erp5testnode to not kill the process.

Inspired by build-rina style.

This reverts commit df51573f.

Unfortunately, the test system shall not rely on IPv6 connectivity of
the VM. Other way to get data from the instance shall be explored.