8067801: Enforce null check for underlying I/O streams

[Brian Burkhalter]

https://bugs.openjdk.java.net/browse/JDK-8067801
http://cr.openjdk.java.net/~bpb/8067801/webrev.00/

Add null check to Filter{In,Out}putStream constructors. This covers all the 
cases listed in the issue as those are all subclasses of these two classes. No 
javadoc update is need due to this statement in the java.io package doc:

"Unless otherwise noted, passing a null argument to a constructor or method in 
any class or interface in this package will cause a NullPointerException to be 
thrown."

Thanks,

Brian