Add Cisco C2960G-8TC-L (#2286)

* add cisco c2960g-8tc-l

* Update WS-C2960G-8TC-L.yaml

Add missing datapoints (airflow, weight)

* Update WS-C2960G-8TC-L.yaml

added maximum power draw

---------

Co-authored-by: Harry

device-types/Cisco/WS-C2960G-8TC-L.yaml

@@ -0,0 +1,34 @@
+---
+manufacturer: Cisco
+model: Catalyst 2960G-8TC-L
+part_number: WS-C2960G-8TC-L
+slug: cisco-ws-c2960g-8tc-l
+u_height: 1
+is_full_depth: false
+airflow: passive
+weight: 1400.0
+weight_unit: g
+console-ports:
+  - name: con 0
+    type: rj-45
+power-ports:
+  - name: POWER
+    type: iec-60320-c14
+    maximum_draw: 12
+interfaces:
+  - name: GigabitEthernet0/1
+    type: 1000base-t
+  - name: GigabitEthernet0/2
+    type: 1000base-t
+  - name: GigabitEthernet0/3
+    type: 1000base-t
+  - name: GigabitEthernet0/4
+    type: 1000base-t
+  - name: GigabitEthernet0/5
+    type: 1000base-t
+  - name: GigabitEthernet0/6
+    type: 1000base-t
+  - name: GigabitEthernet0/7
+    type: 1000base-t
+  - name: GigabitEthernet0/8
+    type: 1000base-t