pcap collection and disk cleaning daemon for net-gargoyle2 honeypot

See https://github.com/jpegleg/net-gargoyle2 for the net-gargoyle2 honeypot base.

The honey-cycle system adds pcap collection and rotation with tcpdump, and cleans up after the net-gargoyle2 sqlite db backups that net-gargoyle2 makes in /opt/net-gargoyle/ when the db reaches the configured sizes, defaulting at 500MB.

honey-cycle creates a self-maintaining honeypot appliance out of net-gargoyle2 that upgrades itself and manages its disk space.

The 'install' file will also install net-gargoyle2 if not already installed. Usage example:

chmod +x install
./install
honey-cycle

Using systemd (unit file installed by script)

systemctl start honey

The file cycler.py is placed in /opt/net-gargoyle/workspace/cycler.py and contains the age in addition to the sleep set in /usr/sbin/honey-cycle

Use the sleep to extend the amount of time each tcpdump is cut off.

If the partion that /opt is in gets 90% or more full, honey-cycle will start deleting .db.gz and .pcap files out of /opt/net-gargoyle/ regardless of their age. If removing those files doesn't get it below 90% it will exit instead of running as to not compound the problem with more pcaps.