Revert old ferm settings related to limit filter

Previous settings (3 hits/1 hour) are good for blocking repeated
offenders with long duration between connections, but very easy to trip
if ssh service is used for ligitimate purpuoses within the cluster.
A better filtering scheme will need to be created.
Merge pull request #8 from drybjed/revert-ferm-limit

Revert old ferm settings related to limit filter