While addressing JDK-8330987, it felt that a number of debug `SSLLogger.isOn(...)` categories seemed like they were not consistently assigned.

I question whether the categorical assignments are correct. Someone in dev should have a look and see if our assignments could be better defined. Does a lot of the code need just `ssl` (always output), or should it be in combination with `handshake`? When you have `handshake`, when should `verbose` be added? Are we consistently `verbose`ing? What does `slctx` have to do with `PredefinedDHParameterSpecs.java`. etc.