nfsd: Increase number of threads

[XaverStiensmeier]

On larger clusters sometimes:

sudo journalctl -xe | grep nfsd | tail -n 1
kernel: nfsd: too many open connections, consider increasing the number of threads

is reported. This can be mitigated by increasing the number of threads: https://askubuntu.com/questions/1488019/how-do-i-increase-the-nfsd-threads-on-boot

Ansible can edit ini files effectively:

- name: Configure NFS
  ansible.builtin.ini_file:
    path: /etc/nfs.conf
    section: nfsd
    option: threads
    value: 32
    no_extra_spaces: yes