Add Avaya / Nortel PowerSupply units, FANs and Temperature Status

Dear Support team,

In our environment, we have around 120 Avaya Switches, and the Health Status were missing until now

I have adjusted myself the discovery needed files for this, and I successfully tested under the following models and versions:

Models tested:

 - ERS3524GT
 - ERS4524GT
 - ERS4524GT-PWR
 - ERS4548GT
 - ERS4548GT-PWR
 - ERS4826GTS
 - ERS4850GTS
 - ERS4850GTS-PWR+
 - ERS4950GTS-PWR+
 - ERS5510-48T
 - ERS5520-24T-PWR
 - ERS5530-24TFD
 - ERS425-24T
 - VSP7024XLS
 - VSP7254XSQ
 - VSP8284XSQ

Versions tested:

 - 3.6.3.05
 - 5.0.8.035
 - 5.1.0.006
 - 5.1.1.2
 - 5.10.1.039
 - 5.6.6.017
 - 5.7.3.031
 - 5.8.2.017
 - 6.0.3.009
 - 6.3.5.025
 - 7.3.0.241
 - 10.4.0.003
 - 10.4.1.009

Please consider checking the attached files and maybe commit the changes in a future version.

Files:

 /opt/observium/includes/definitions/mibs/nortel.inc.php
 /opt/observium/includes/discovery/sensors/rapid-city.inc.php (new file)
 /opt/observium/includes/discovery/sensors/s5-chassis-mib.inc.php

Best regards,