RFR: JDK-8159544: Remove deprecated classes in com.sun.security.auth.**

[Sean Mullan]

Please review this JDK 10 change to remove the deprecated classes in 
com.sun.security.auth.** that have been previously marked with 
forRemoval=true in JDK 9.

webrev: http://cr.openjdk.java.net/~mullan/webrevs/8159544/
I have also copied Jan for reviewing a change in langtools, and also 
build-dev for a change to one of the JDK Makefiles.

Thanks,
Sean