esx: Add support for the VMXNET 2 (Enhanced) NIC model

Add a test case and document it.

tests/xml2vmxdata/xml2vmx-ethernet-vmxnet2.vmx

@@ -0,0 +1,14 @@
+config.version = "8"
+virtualHW.version = "4"
+guestOS = "other"
+uuid.bios = "56 4d 9b ef ac d9 b4 e0-c8 f0 ae a8 b9 10 35 15"
+displayName = "ethernet-vmxnet2"
+memsize = "4"
+numvcpus = "1"
+ethernet0.present = "true"
+ethernet0.virtualDev = "vmxnet"
+ethernet0.features = "15"
+ethernet0.networkName = "VM Network"
+ethernet0.connectionType = "bridged"
+ethernet0.addressType = "static"
+ethernet0.address = "00:50:56:11:22:33"

tests/xml2vmxdata/xml2vmx-ethernet-vmxnet2.xml

@@ -0,0 +1,15 @@
+<domain type='vmware'>
+  <name>ethernet-vmxnet2</name>
+  <uuid>564d9bef-acd9-b4e0-c8f0-aea8b9103515</uuid>
+  <memory>4096</memory>
+  <os>
+    <type>hvm</type>
+  </os>
+  <devices>
+    <interface type='bridge'>
+      <mac address='00:50:56:11:22:33'/>
+      <source bridge='VM Network'/>
+      <model type='vmxnet2'/>
+    </interface>
+  </devices>
+</domain>