[psushow & psuutil] Support PSU power threshold checking

[stephenxs]

What I did

Support PSU power threshold checking

1. Introduce a new state for the PSU, indicating whether a PSU power threshold is exceeded
2. For psuutil, expose the power thresholds
3. Add HW Rev to psuutil

Signed-off-by: Stephen Sun [email protected]

How I did it

How to verify it

Unit and manual test

Previous command output (if the output of a command-line utility has changed)

New command output (if the output of a command-line utility has changed)

[lgtm-com[bot]]

This pull request introduces 2 alerts when merging f5165b31148c82e0ecfd9e4aee901149551a3c1c into e14f679148159d7dc3f10fa2662fb8f7b202c3fc - view on LGTM.com

new alerts:

• 2 for Testing equality to None

[prgeor]

@stephenxs could you resolve merge conflicts?

[prgeor]

@stephenxs Please populate these sections of the PR template:-

Previous command output (if the output of a command-line utility has changed)
New command output (if the output of a command-line utility has changed)

[stephenxs]

@stephenxs Please populate these sections of the PR template:-

Previous command output (if the output of a command-line utility has changed)
New command output (if the output of a command-line utility has changed)

Done

[stephenxs]

@stephenxs could you resolve merge conflicts?

Done by rebasing it.

[stephenxs]

psutest.txt @prgeor a test log. all PSU test passed