add rsyncd config for apache config sync

this is the equivalent to /etc/rsync.d/frag-httpdconf
on nfs1 (which is the NFS home mounted on fenari)

in Ie1f623e857 I change the sync-script to fetch from there
in order to migrate it from pmtpa to eqiad

RT #6145

Change-Id: I54c82e2a50c4e396c36e1e4efb2b144e10e0d3ab