* Fix missing PoE port graphs for Cisco Catalyst 9K
* Reworked code: 2 assignments, added tests
* Simplify code
Checking the MIBs...
CISCO-POWER-ETHERNET-EXT-MIB: AUGMENTS { pethPsePortEntry }
POWER-ETHERNET-MIB: INDEX { pethPsePortGroupIndex , pethPsePortIndex }
This means cpeExtPsePortEntry is always indexed by exactly 2 values. No point in populating slot.subslot.port
Co-authored-by: Tony Murray <murraytony@gmail.com>
