Add Lenovo system x3550 M5 server (#312)

* Add Lenovo system x3550 M5 server

device-types/Lenovo/system_x3550_M5.yaml

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+manufacturer: Lenovo
+model: System x3550 M5
+slug: system_x3550_m5
+part_number: 5463AC1
+u_height: 1
+is_full_depth: true
+comments: '[Lenovo System x3550 M5 product guide](https://lenovopress.com/tips1194.pdf)'
+power-ports:
+  - name: PSU 1
+    type: iec-60320-c14
+  - name: PSU 2
+    type: iec-60320-c14
+interfaces:
+  - name: Ethernet 1
+    type: 1000base-t
+  - name: Ethernet 2
+    type: 1000base-t
+  - name: Ethernet 3
+    type: 1000base-t
+  - name: Ethernet 4
+    type: 1000base-t
+  - name: IMM 
+    type: 100base-tx
+    mgmt_only: true
+console-ports:
+  - name: Front VGA
+    type: other
+  - name: Rear VGA
+    type: other
+  - name: Front usb 3.0
+    type: usb-a
+  - name: Front usb 2.0
+    type: usb-a
+  - name: Rear usb 3.0 (Left)
+    type: usb-a
+  - name: Rear usb 3.0 (Rigth)
+    type: usb-a