Add Eaton UPS 9PX and related devices/modules (#860)

* device and module types for 9PX, battery module, network card, and sensor

* remove 'null' power allocation from 9PX3000iRT2U

* turn environmental probe into module, add corresponding module slots to UPS

* remove leftover definitions from converting device to module for EMPDT1H1C2

module-types/Eaton/EMPDT1H1C2.yaml

@@ -0,0 +1,16 @@
+---
+manufacturer: Eaton
+model: Environmental Monitoring Probe Gen 2
+part_number: EMPDT1H1C2
+comments: Environmental Monitoring Probe Gen 2 [Manual](https://www.eaton.com/content/dam/eaton/products/backup-power-ups-surge-it-power-distribution/power-management-software-connectivity/eaton-environmental-monitoring-probe-gen-2/eaton-emp-gen-2-manual.pdf)
+interfaces:
+  - name: EMP{module}/Device
+    type: other
+    mgmt_only: false
+    label: from device
+    description: RJ45 connector for RS485/Modbus connection
+  - name: EMP{module}/Sensors
+    type: other
+    mgmt_only: false
+    label: to sensors
+    description: RJ45 connector for RS485/Modbus connection

module-types/Eaton/Network-M2.yaml

@@ -0,0 +1,20 @@
+---
+manufacturer: Eaton
+model: Network-M2
+part_number: 744-A3983-02
+comments: Gigabit Network Card [Manual](https://www.eaton.com/content/dam/eaton/products/backup-power-ups-surge-it-power-distribution/power-management-software-connectivity/eaton-gigabit-network-card/eaton-network-m2-user-guide.pdf)
+interfaces:
+  - name: RNDIS
+    type: other
+    mgmt_only: true
+    label: Settings
+    description: RNDIS (Ethernet over USB) connection with USB Micro-B connector
+  - name: Sensors
+    type: other
+    mgmt_only: false
+    label: AUX
+    description: USB-A connection for USB to RS485/Modbus connection to environmental
+      sensors
+  - name: mgmt
+    type: 1000base-t
+    mgmt_only: true