new(libsinsp/test): add basic tests for networking and container events

[LucaGuerra]

What type of PR is this?

Uncomment one (or more) /kind <> lines:

/kind feature

Any specific area of the project related to this PR?

Uncomment one (or more) /area <> lines:

/area libsinsp

/area tests

/area proposals

Does this PR require a change in the driver versions?

/version driver-API-version-major

/version driver-API-version-minor

/version driver-API-version-patch

/version driver-SCHEMA-version-major

/version driver-SCHEMA-version-minor

/version driver-SCHEMA-version-patch

What this PR does / why we need it:

These new tests exercise simple cases of ipv4/ipv6 connections (which we all know can have many weird corner cases), including some highlighted here: https://github.com/falcosecurity/libs/issues/260 , plus container metadata parsing through container events.

More importantly, I think, convenience functions to deal with sockaddr have been added, so that people that need to add more tests don't need to figure out the scap format for connections.

This brings libsinsp coverage from ~19% to ~23%~ ~24%

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

[poiana]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: LucaGuerra

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[LucaGuerra]

Interesting, this fails with a minimal build, will investigate.

[FedeDP]

/milestone 0.10.0

But this can be moved to 0.9.0 as it adds tests, IMHO.

[Andreagit97]

This should be rebased :)

[LucaGuerra]

Will be reopening this now, with 50% more refactoring and rebasing