device: Update avaya-vsp.yaml to reflect new vendor name (#8373)

* Update avaya-vsp.yaml

Extreme purchased the Avaya network assets and so I need to rebrand the VSP to be Extreme.  I am changing the icon to be Extreme.  I am also adding support for the 8404c which is  sysObjectID .1.3.6.1.4.1.2272.220

* Create avaya-vsp_8404c.snmprec

need to add a new vsp 8404c chassis support for avaya/extreme

* Added generated json file

* Udated test files

includes/definitions/avaya-vsp.yaml

@@ -1,7 +1,7 @@
 os: avaya-vsp
-text: 'Avaya VOSS'
+text: 'Extreme VOSS'
 type: network
-icon: avaya
+icon: extreme
 mib_dir:
     - nortel
 over:
@@ -17,6 +17,7 @@ discovery:
         - .1.3.6.1.4.1.2272.208
         - .1.3.6.1.4.1.2272.209
         - .1.3.6.1.4.1.2272.210
+        - .1.3.6.1.4.1.2272.220
         - .1.3.6.1.4.1.45.3.79.1
 good_if:
-    - 'Virtual Services Platform'
+    - 'Virtual Services Platform'