add SMART app support

[VVelox]

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Replaces #6128 as that one ate it's self in a rebase.

Depends on librenms/librenms-agent#101 .

[mention-bot]

Thank you for submitting a PR @VVelox! We have found the following @murrant, @crcro and @karlshea based on the history of these files to review this PR.

[LibreNMS-CI]

Auto-Deploy finished, Test PR at http://6181.ci.librenms.org or https://6181.ci.librenms.org

[scrutinizer-notifier]

The inspection completed: 1 new issues, 1 updated code elements

[laf]

I've put a mention up on community and an old issue here to test this.

[sorano]

I tested this last week and after some fixes in the script from VVelox it worked.