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">
<!-- 'key' attribute is expected. 'key1' is mistyped -->
<properties>
<comment>comment1</comment>
<entry key1="typo">value of the first key</entry>
</properties>