Order nss-user-lookup.target after nslcd.service

See: systemd.special(7) entry on nss-user-lookup.target.

nslcd provides LDAP based user lookups. nss-user-lookup.target should only be reached when all user lookup services are ready. So order accordingly.

systemd.special(7) also suggests to add a Wants= for services providing user lookup. So also add that.

NOTES:

• I have NOT tested this chef recipe changes in any way. They're meant as a suggestion.
• I HAVE tested this locally by having a /etc/systemd/system/nslcd.service.d/nss-user-lookup.conf with this content:

  [Unit]
  Before=nss-user-lookup.target
  Wants=nss-user-lookup.target