RFR JDK 9 (JAXP) 8150969 : DEFER from Features API is taking precedence over defer preference in catalog file.

[huizhe wang]

Hi,

Fix a typo in the catalog reader where the intention was to set the 
defer attribute, but the prefer was set instead. The tests are from the 
JCK.

JBS: https://bugs.openjdk.java.net/browse/JDK-8150969
webrevs: http://cr.openjdk.java.net/~joehw/jdk9/8150969/webrev/

Thanks,
Joe