Increase open file limit number of open file limit on HN host node and vm / ct

DO THIS IN HN (hardware nodes):

nano /etc/security/limits.conf

# wildcard does not work for root, but for all other users

*               soft     nofile           65536

*               hard     nofile           65536

# settings should also apply to root

root            soft     nofile           65536

root            hard     nofile           65536

ulimit -n 65536

do not need to modify pam limits

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for each CTs we also need to do this: