driver/power: Fix YKUSH power driver

[mbgg]

The pykush module needs an import like this:
from pykush import pykush

Fix the YKUSH driver to reflect this change.

Signed-off-by: Matthias Brugger matthias.bgg@kernel.org

Description

Checklist

• Documentation for the feature
• Tests for the feature

• The arguments and description in doc/configuration.rst have been updated

• Add a section on how to use the feature to doc/usage.rst

• Add a section on how to use the feature to doc/development.rst

• CHANGES.rst has been updated

• PR has been tested

• Man pages have been regenerated

[codecov]

Codecov Report

Merging #549 into master will not change coverage.
The diff coverage is 0%.

@@          Coverage Diff           @@
##           master    #549   +/-   ##
======================================
  Coverage    56.8%   56.8%           
======================================
  Files         127     127           
  Lines        8730    8730           
======================================
  Hits         4965    4965           
  Misses       3765    3765

Impacted Files	Coverage Δ
labgrid/driver/powerdriver.py	68.2% <0%> (ø)	⬆️

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[jluebbe]

It seems the readme in the project repository is wrong (it uses import pykush). The original submission of this power driver by @tgbloks depended on Yepkit/pykush#1, which is not yet merged.