JDK 9 Review Request for 8046949: Generify the javax.xml.crypto API

[Sean Mullan]

Earlier this year, we dropped the requirement to deliver JSR 105 (XML 
Digital Signature API) as a standalone JSR [1], which will make it 
easier to add some long-standing enhancements to the API.

The first of those is to finally add support for generics to the API:

- all Collection and Iterator parameters and return types have been 
changed to parameterized types
- javax.xml.crypto.NodeSetData has been changed to a generic class and 
also now implements Iterable so that it can be used in for-each loops
- many SuppressWarnings annotations have been removed as they are no 
longer applicable

Issue: https://bugs.openjdk.java.net/browse/JDK-8046949
webrev: http://cr.openjdk.java.net/~mullan/webrevs/8046949/webrev.00/

--Sean

[1] https://jcp.org/en/jsr/proposalDetails?id=105