Replace supervisord with systemd in LDAP troubleshooting (#4569)
Replace supervisord with systemd in LDAP troubleshooting (#4569)

Update the LDAP troubleshooting steps so that they are consistent with the rest of the documentaiton, which nowadays expects us to be running netbox via systemd instead of supervisord. Fixes #4504.
digitalocean/netbox,digitalocean/netbox,digitalocean/netbox,digitalocean/netbox