Right now exit code 4 stands for hosts being unreachable [1], that might
take place in envoronments at the moment of adding new computes
So instead of failing the script and asking for user to re-run commands
manually we silently proceed when anything fails with unreachable hosts.
[1] 74f6e6a134/lib/ansible/executor/task_queue_manager.py (L128C5-L128C26)
Change-Id: Ib422f181256a67cbde4b485c1f1e9079d0400faf
49b268634a