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">
<!-- namespace is not supported -->
<javautil:properties xmlns:javautil="http://java.sun.com/java/util/Properties">
<javautil:comment>comment1</javautil:comment>
<javautil:entry key="firstkey">value of the first key</javautil:entry>
<javautil:entry key="secondkey">value of the second key</javautil:entry>
</javautil:properties>