Services started with systemd on CentOS 7, and possibly other platforms ignore ulimit unless the LimitNOFILE
parameter is set in the systemd unit file.
As fqdn could be longer than 60 characters in some cases, causing the cluster node to not start.
tests:
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This avoids an issue with latest puppet agent
But is not needed anyhow, as a minimal value of 0 already means wait indefinitely
Fixes #418
addition to #421