sync: release 0.17.1

[FedeDP]

What type of PR is this?

/kind cleanup

Any specific area of the project related to this PR?

/area libsinsp

Does this PR require a change in the driver versions?

What this PR does / why we need it:

Cherry picks 2 PRs from master for the 0.17.1 release:

• new(userspace/libsinsp): support lxc 4.0 cgroup layout. #1879
• fix(userspace/libsinsp): fixed possible buffer overflow in sinsp_plugin::get_metrics #1880

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

[FedeDP]

/milestone 0.17.1

[FedeDP]

Closing and reopening to re-trigger ci after base change.
/close

[poiana]

@FedeDP: Closed this PR.

In response to this:

Closing and reopening to re-trigger ci after base change.
/close

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[FedeDP]

/reopen

[poiana]

@FedeDP: Reopened this PR.

In response to this:

/reopen

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[Andreagit97]

/approve

[poiana]

[APPROVALNOTIFIER] This PR is APPROVED

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

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• OWNERS [Andreagit97,FedeDP,LucaGuerra]

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