RFR 9: 8155760 Implement Serialization Filtering - revised for extensibility

[Roger Riggs]

To more easily support future enhancement of the information provided to 
the serial filter
the API has been modified to pass the information to the filter via an 
interface with methods
for the class, array length, references, depth and stream bytes.

Complete webrev supporting Serialization Filtering:
http://cr.openjdk.java.net/~rriggs/webrev-serial-filter-jdk9-8155760/

The specdiff of these changes are:
http://cr.openjdk.java.net/~rriggs/filter-diffs-8166739/overview-summary.html

Javadoc (subset)
http://cr.openjdk.java.net/~rriggs/filter-javadoc/java/io/ObjectInputStream.html
http://cr.openjdk.java.net/~rriggs/filter-javadoc/java/io/ObjectInputFilter.html
http://cr.openjdk.java.net/~rriggs/filter-javadoc/java/io/SerializablePermission.html

Thanks, Roger