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="utf8" standalone="no"?>
<!DOCTYPE properties SYSTEM "http://java.sun.com/dtd/properties.dtd">
<!-- XML tags are case sensitve, the root element should have been in lower case -->
<Properties>
<comment>comment</comment>
<entry key="firstKey">value of the first key</entry>
</Properties>