Issue #119 - fix NAME parameter in nut-upsd

[instantlinux]

Summary of Changes

Fix the default healthcheck for nut-upsd image.

Why is this change being made?

To address bug report from @Alarez777:

The healthcheck does not work in the nut-upsd container when the NAME environment variable is changed. It seems that the problem is in docker-tools/images/nut-upsd/dockerfile in this line because the $NAME variable is not considered:

HEALTHCHECK CMD upsc ups@localhost:3493 2>&1|grep -q stale && exit 1 || true

How was this tested? How can the reviewer verify your testing?

Local test: built image, launched with $NAME unset, then with $NAME set to a non-default value.

Completion checklist

• The pull request is linked to all related issues
• This change has unit test coverage
• Documentation has been updated
• Dependencies have been updated and verified