updated wait_for_ssh_access nodes reporting, collection and retries
- collection of failed nodes using separate files
- timeout set to 15 retries
set run_all a8 duration to 10 minutes
refactored a8_setup() in run_all.sh
fixed setup_a8_nodes.sh unused error file
rephrased ssh cmdline in setup_a8_nodes.sh
refactored setup_a8_nodes.sh output (fixed tmp files removal issue)