Update snmp_exporter

[SuperQ]

• Use 0.15.0.
• Add scrape job to monitor the snmp_exporter.
• Add Enum options to generator config.
• Regenerate the snmp config.
• Remove rouge AP table module, it never worked.

[brian-brazil]

:+1:

[krokodilerian]

I don't see a reason this isn't merged, but as doing mostly video, it doesn't feel right for me to merge it.

[RichiH]

Sorry, I totally dropped this.

@SuperQ do you want to update the PR or are you good to go?

[SuperQ]

Yes, I can go through a round of updates.

[SuperQ]

Ok, cleaned up the PR and re-generated the snmp.yml from the latest MIBs.