RFR (JAXP) 8146237: PREFER from Features API taking precedence over catalog file

[huizhe wang]

Hi,

Please review a fix on missing property settings read from catalog 
files. Values from catalog files shall override any other settings 
including those through the API, e.g. 
builder().with(CatalogFeatures.Feature.PREFER, "system").

JBS: https://bugs.openjdk.java.net/browse/JDK-8146237
webrevs: http://cr.openjdk.java.net/~joehw/jdk9/8146237/webrev/

Thanks,
Joe