Add UHP Satellite Router v3.5 Support

Hello,

We run a few hundred UHP Satellite Routers which the monitoring with Observium does not work well as a lot of the important OIDs are RF related, and require math to be done to them in order to get usable numbers. For example, one of the transit RF levels requires the gauge value / -10 to get the actual number.

Attached is the UHP3.5 MIB file from the vendor, and the myagent.snmpwalk file found in other add device issues.