InternetDB: option to display open ports

[TheTechromancer]

Adds an option to display OPEN_TCP_PORT events from internetdb:

bbot -t evilcorp.com -m internetdb -c modules.internetdb.show_open_ports=true

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 92%. Comparing base (85d5e92) to head (381e694). Report is 23 commits behind head on dev.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## dev #1437 +/- ## ====================================== - Coverage 92% 92% -0% ====================================== Files 321 323 +2 Lines 20685 20855 +170 ====================================== + Hits 19017 19163 +146 - Misses 1668 1692 +24 ```

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