nfs: Allow not to publish to loginbroker

All the other doors allow this.

Target: trunk
Request: 2.11
Request: 2.10
Reported-by: Xavier Mol <xavier.mol@kit.edu>
Require-notes: yes
Require-book: no
Acked-by: Tigran Mkrtchyan <tigran.mkrtchyan@desy.de>
Patch: https://rb.dcache.org/r/7622/
(cherry picked from commit 1d2e6e29c958f174cb4278616b2d337cf9d01a1e)
Merge pull request #1209 from gbehrmann/fix/2.11/rb7622

nfs: Allow not to publish to loginbroker