new(gvisor): get socket from configuration file, fix tests

[LucaGuerra]

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-bpf

/area driver-modern-bpf

/area libscap-engine-bpf

/area libscap-engine-gvisor

/area libscap-engine-kmod

/area libscap-engine-modern-bpf

/area libscap-engine-nodriver

/area libscap-engine-noop

/area libscap-engine-source-plugin

/area libscap-engine-udig

/area libscap

/area libsinsp

/area tests

/area proposals

What this PR does / why we need it:

This PR adds some enhancements to gVisor support:

1. small change to the interface to be able to read the socket directly from the configuration file
2. fixes to the procfs unit test and parsing

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

new(gvisor): enable reading the socket path from configuration file

[poiana]

Hi @LucaGuerra. 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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[loresuso]

Very nice PR, I like it!

[FedeDP]

Very nice PR as always Luca!
/ok-to-test

[FedeDP]

/approve

[poiana]

LGTM label has been added.

Git tree hash: af5e92948c32d9cd61bea9aa2326b20a3e31ed59

[Andreagit97]

/approve

[poiana]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Andreagit97, FedeDP, LucaGuerra

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