Allied Telesis MCR12 and Modules (#1021)

* Added Allied Telesis MCR12 and other modules used with it

* Added the rest of the FS2xx series Allied Telesis modules

device-types/Allied Telesis/MCR12.yaml

@@ -0,0 +1,38 @@
+---
+manufacturer: Allied Telesis
+model: MCR12
+slug: at-mcr12
+part_number: MCR12
+u_height: 3
+is_full_depth: false
+module-bays:
+  - name: Power Supply A
+    position: A
+    label: PSU 1
+  - name: Power Supply B
+    position: B
+    label: PSU 2
+  - name: Slot 1
+    position: '1'
+  - name: Slot 2
+    position: '2'
+  - name: Slot 3
+    position: '3'
+  - name: Slot 4
+    position: '4'
+  - name: Slot 5
+    position: '5'
+  - name: Slot 6
+    position: '6'
+  - name: Slot 7
+    position: '7'
+  - name: Slot 8
+    position: '8'
+  - name: Slot 9
+    position: '9'
+  - name: Slot 10
+    position: '10'
+  - name: Slot 11
+    position: '11'
+  - name: Slot 12
+    position: '12'