add netscaler mpx-89xx (#1494)

* add netscaler mpx-89xx

* updated mpx model

* fixed comments line

---------

Co-authored-by: Daniel W. Anner <daniel.anner@danstechsupport.com>

device-types/Citrix/MPX-8910.yaml

+---
+manufacturer: Citrix
+model: MPX-8910
+slug: citrix-mpx-8910
+u_height: 1
+is_full_depth: true
+weight: 24.91
+weight_unit: lb
+airflow: front-to-rear
+comments: '[Hardware Information](https://docs.netscaler.com/en-us/citrix-hardware-platforms/mpx/netscaler-hardware-platforms/citrix-netscaler-mpx-8900)'
+console-ports:
+  - name: Console
+    type: de-9
+power-ports:
+  - name: PS 1
+    type: iec-60320-c14
+    maximum_draw: 450
+  - name: PS 2
+    type: iec-60320-c14
+    maximum_draw: 450
+interfaces:
+  - name: Interface 0/1
+    type: 1000base-t
+    mgmt_only: true
+  - name: Interface 1/1
+    type: 1000base-t
+  - name: Interface 1/2
+    type: 1000base-t
+  - name: Interface 1/3
+    type: 1000base-t
+  - name: Interface 1/4
+    type: 1000base-t
+  - name: Interface 1/5
+    type: 1000base-t
+  - name: Interface 1/6
+    type: 1000base-t
+  - name: Interface 10/1
+    type: 10gbase-x-sfpp
+  - name: Interface 10/2
+    type: 10gbase-x-sfpp
+  - name: Interface 10/3
+    type: 10gbase-x-sfpp
+  - name: Interface 10/4
+    type: 10gbase-x-sfpp
+  - name: LOM
+    type: 1000base-t
+    mgmt_only: true