Use a fixed SAX parser configuration.
Use a fixed SAX parser configuration.

As documented in http://xerces.apache.org/xerces2-j/faq-xni.html, a
system-installed JAR can override the default parser configuration
by setting the org.apache.xerces.xni.parser.XMLParserConfiguration
system property.


Former-commit-id: b381e06c3bac8b2eae4c5424d37a72bf386b778c
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine