Validation requirement should come from the model factory

A regression relative to how we parse application.xml without validation jbossas4.2 and earlier is showing up in placeholder application.xml deployments like:

<!DOCTYPE application PUBLIC
"-//Sun Microsystems, Inc.//DTD J2EE Application 1.3//EN"
"http://java.sun.com/dtd/application_1_3.dtd">

<application>
<display-name>Resource Loading Ear</display-name>
</application>

This fails because this dtd requires at least one module as well:

Caused by: org.jboss.xb.binding.JBossXBException: Failed to parse source: vfsfil
e:/C:/home/svn/JBossHead/jboss-head/testsuite/output/lib/unpacked/loadingresourc
e2.ear/META-INF/application.xml@7,15
at org.jboss.xb.binding.parser.sax.SaxJBossXBParser.parse(SaxJBossXBPars
er.java:173)
at org.jboss.xb.binding.UnmarshallerImpl.unmarshal(UnmarshallerImpl.java
:180)
at org.jboss.deployers.plugins.deployers.helpers.ObjectModelFactoryDeplo
yer.parse(ObjectModelFactoryDeployer.java:83)
... 70 more
Caused by: org.xml.sax.SAXException: The content of element type "application" i
s incomplete, it must match "(icon?,display-name,description?,module+,security-r
ole*)". @ vfsfile:/C:/home/svn/JBossHead/jboss-head/testsuite/output/lib/unpacke
d/loadingresource2.ear/META-INF/application.xml[7,15]
at org.jboss.xb.binding.parser.sax.SaxJBossXBParser$MetaDataErrorHandler
.error(SaxJBossXBParser.java:406)
at org.apache.xerces.util.ErrorHandlerWrapper.error(Unknown Source)
at org.apache.xerces.impl.XMLErrorReporter.reportError(Unknown Source)
at org.apache.xerces.impl.XMLErrorReporter.reportError(Unknown Source)
at org.apache.xerces.impl.dtd.XMLDTDValidator.handleEndElement(Unknown S

To allow for similar behavior, we need to allow the ObjectModelFactory used by the deployer to indicate whether validation is needed.