RFR (JAXP): 8049514: FEATURE_SECURE_PROCESSING can not be turned off on a validator through SchemaFactory

[huizhe wang]

Hi,

JAXP SecurityManager was re-designed to XMLSecurityManager to manage 
jaxp related limits or restrictions. Previously, the existence of a 
SecurityManager was equivalent to setting FEATURE_SECURE_PROCESSING to 
true. After the change, secure processing became a property of 
XMLSecurityManager, thus needs to be queried in order to determine the 
status of secure processing.

Since secure processing is true by default, this bug made it impossible 
to turn off secure processing on a validator through the factory when 
there is no Java Security Manager.

Please review:
http://cr.openjdk.java.net/~joehw/jdk9/8049514/webrev/

Thanks,
Joe