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"?>
<!DOCTYPE properties SYSTEM "http://java.sun.com/dtd/properties.dtd"
[<!ENTITY intEnt 'value3'> ]>
<?PITarget PIContent?>
<properties>
<comment>Property With Other Encoding</comment>
<entry key="Key1">value1</entry>
<entry key="Key2"><![CDATA[<value2>]]></entry>
<entry key="Key3">&intEnt;</entry>
</properties>