Reintroducing the token_bucket unit test adapted to gtest

[loresuso]

What type of PR is this?

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

/kind bug

/kind cleanup

/kind design

/kind documentation

/kind failing-test

/kind feature

Any specific area of the project related to this PR?

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/area build

/area driver-kmod

/area driver-ebpf

/area libscap

/area libsinsp

/area tests

/area proposals

What this PR does / why we need it:
This PR reintroduces the token_bucket unit test that previously belonged to the falco repository. As token_bucket was moved from there to this repository, its unit tests must be adapted to use gtest, since this is the testing framework that libs uses.

Which issue(s) this PR fixes:

Fixes #137

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

[poiana]

Hi @loresuso. Thanks for your PR.

I'm waiting for a falcosecurity member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[leogr]

/ok-to-test

[leogr]

/approve

[poiana]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: leogr, loresuso

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[poiana]

LGTM label has been added.

Git tree hash: c5da5f0045d06fdfed228f6c8556e8876ad42f77

[FedeDP]

Great job, thanks!

[poiana]

@FedeDP: changing LGTM is restricted to collaborators

In response to this:

Great job, thanks!

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[leogr]

/cc @mstemm