8005280: (props) Improve test coverage for small XML parser
Summary: added a few more invalid XML files, international characters to LoadAndStore test, and a behavior compatibility test.
Reviewed-by: alanb, lancea
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!-- An XML properties document has the DOCTYPE declaration with the properties root element -->
<properties>
<entry key="foo">bar</entry>
<entry key="gus">baz</entry>
</properties>