esx: Map the .vmx annotation to the domain XML description

Take care of escaping '"' and '|' (the escape character).

Add tests for this.

tests/vmx2xmldata/vmx2xml-annotation.vmx

@@ -0,0 +1,3 @@
+config.version = "8"
+virtualHW.version = "4"
+annotation = "Some |7Ctext|7C to test the |22escaping|22: |7C|7C|22|22|7C|7C|22|7C |45|73|63|61|70|65|64|21"

tests/vmx2xmldata/vmx2xml-annotation.xml

@@ -0,0 +1,16 @@
+<domain type='vmware'>
+  <uuid>00000000-0000-0000-0000-000000000000</uuid>
+  <description>Some |text| to test the &quot;escaping&quot;: ||&quot;&quot;||&quot;| Escaped!</description>
+  <memory>32768</memory>
+  <currentMemory>32768</currentMemory>
+  <vcpu>1</vcpu>
+  <os>
+    <type arch='i686'>hvm</type>
+  </os>
+  <clock offset='utc'/>
+  <on_poweroff>destroy</on_poweroff>
+  <on_reboot>restart</on_reboot>
+  <on_crash>destroy</on_crash>
+  <devices>
+  </devices>
+</domain>