Enable PSI metric data

[SuperQ]

Change summary

Enable the kernel Pressure Stall Information accounting feature. This allows users to gather data on CPU and memory starvation. It's very useful to help find cases where the system performance is impacted by overloaded CPUs.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Code style update (formatting, renaming)
• Refactoring (no functional changes)
• Migration from an old Vyatta component to vyos-1x, please link to related PR inside obsoleted component
• Other (please describe):

Related Task(s)

Related PR(s)

• https://docs.kernel.org/accounting/psi.html
• https://facebookmicrosites.github.io/psi/docs/overview

How to test / Smoketest result

Simple check to see if the values show up in /proc.

cat /proc/pressure/cpu

Or provide the output of the smoketest

$ /usr/libexec/vyos/tests/smoke/cli/test_xxx_feature.py
test_01_simple_options (__main__.TestFeature.test_01_simple_options) ... ok

-->

Checklist:

• I have read the CONTRIBUTING document
• I have linked this PR to one or more Phabricator Task(s)
• My commit headlines contain a valid Task id
• My change requires a change to the documentation
• I have updated the documentation accordingly

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