RFR(JDK10/JAXP): 8181153: Fix lint warnings in JAXP repo: dep-ann

[huizhe wang]

Hi,

This change fixes dep-ann warnings.

(1) For most cases, @Deprecated is simply added below the @deprecated 
javadoc tag and above the relevant class or method.

(2) For XSLTErrorResources*.java, unused constants are removed.

(3) DOM2Helper.java
     The original DOM2Helper was deprecated and now removed. Useful 
methods are consolidated into utils/DOM2Helper.java. The usages in 
AttList and TreeWalker are updated accordingly.

     **Note that there's no change to the methods in DOM2Helper, they 
are simply copied from the original DOM2Helper and DOMHelper.

All tests passed. JCK 9 passed.

JBS: https://bugs.openjdk.java.net/browse/JDK-8181153
webrevs: http://cr.openjdk.java.net/~joehw/jdk10/8181153/webrev/

Thanks,
Joe