Merge branch 'nf-conntrack-helper' into 'master'

base: remove obsolete nf_conntrack_helper

See merge request !300

roles/float-base/files/modprobe-hardening.conf

-# Disable automatic conntrack helper assignment.
-options nf_conntrack nf_conntrack_helper=0
-
 # Obscure network protocols with a bad security track record.
 install dccp /bin/false
 install sctp /bin/false