Spike: Research bash tools available for closing ports

[Pactopolis]

Research possible tools available for bash scripts that:

• port scanning
• identifying necessary ports
• closing unnecessary ports

Depends on #10 Close uneeded ports

[Pactopolis]

https://linuxconfig.org/how-to-deny-all-incoming-ports-except-ssh-port-22-on-ubuntu-18-04-bionic-beaver-linux