JEP 486 SecurityManager disabling cleanup

[Philip Race]

To interested parties

JEP 486 disabled the SecurityManager and updated public specs but 
consciously avoided
going further, for example removing JDK code that expected a SM might be 
in place.
JEP 486 is done, and that's fine.

I am now coordinating efforts to try to remove that expectation of an SM 
in the client-libs implementation.
Whatever we can get done in the same release as the SM disabling will be 
good for consistency.
I think we can do almost all of it before RDP 1. Fingers crossed.

Bugs  and PRs you may see now and very soon will not address everything 
but there will be follow-ups.
Soon, very soon, if we get the initial ones focused on doPrivileged 
integrated quickly.

A few things I want to do will involve CSRs to deprecate classes and 
methods that are obsoleted.
I will deal with those at the right time in the rapid flow of changes.

-phil