Improvements to PA-220 model (#1499)

* Improvements to PA-220 model

* Connect power outlet to power port

* Lint fixup

* Fixup slugs

* Removing modelling of power brick

* Add missing newline at EOF

* Rename file to match naming standard

* Explicitly specify that rack trays aren't powered

* Added airflow and weight info

(Unfortunately no weight info available for the rack trays)

* File name, device name and slug fixups

---------

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

device-types/Palo Alto/PA-220-Rack-Kit.yaml

@@ -0,0 +1,12 @@
+---
+manufacturer: Palo Alto
+model: PA-220 Rack Kit
+slug: palo-alto-pa-220-rack-kit
+part_number: PAN-PA-220-RACK-SINGLE
+u_height: 1
+subdevice_role: parent
+is_full_depth: false
+is_powered: false
+airflow: passive
+device-bays:
+  - name: Firewall

device-types/Palo Alto/PA-220-Rack-Tray-Kit.yaml

@@ -0,0 +1,13 @@
+---
+manufacturer: Palo Alto
+model: PA-220 Rack Tray Kit
+slug: palo-alto-pa-220-rack-tray-kit
+part_number: PAN-PA-220-RACKTRAY
+u_height: 1
+subdevice_role: parent
+is_full_depth: false
+is_powered: false
+airflow: passive
+device-bays:
+  - name: Firewall A
+  - name: Firewall B

device-types/Palo Alto/PA-220.yaml

@@ -3,14 +3,18 @@ manufacturer: Palo Alto
 model: PA-220
 slug: palo-alto-pa-220
 part_number: PA-220
-u_height: 1
+u_height: 0
+subdevice_role: child
 is_full_depth: false
 comments: '[PA-220 Datasheet](https://www.paloaltonetworks.com/resources/datasheets/pa-220-specsheet)'
+airflow: passive
+weight: 3
+weight_unit: lb
 power-ports:
   - name: PS1
-    type: nema-1-15p
+    type: dc-terminal
   - name: PS2
-    type: nema-1-15p
+    type: dc-terminal
 console-ports:
   - name: console
     type: rj-45