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.

Now the testing partition is able to fetch data from tested VM, by using
its public ipv6 address, to which the VM can post results.

This is first step of reusing KVM SR with own instance configuration.

This is backup commit