8228392: java.io.Filter{In,Out}put stream constructors should allow null stream parameter

[Brian Burkhalter]

https://bugs.openjdk.java.net/browse/JDK-8228392
http://cr.openjdk.java.net/~bpb/8228392/webrev.00/

This moves the NPE from the Filter{In,Out}putStream constructors to the subclass constructors.

One thing which should be considered as an alternative would be not to check for null at all in these constructors but update the subclass constructor specifications to override the class documentation and indicate that the underlying stream parameter may be null.

This change has passed the tier 1-3 tests modulo one timeout of an unrelated tier 2 test.

Thanks,

Brian