RFR: JDK-8284688 Minor cleanup could be done in java.security.jgss [v6]

[Mark Powers]

> https://bugs.openjdk.java.net/browse/JDK-8284688
> 
> [JDK-8273046](https://bugs.openjdk.java.net/browse/JDK-8273046) is the umbrella bug for this bug. The changes were too large for a single code review, so it was decided to split into smaller chunks. This is one such chunk: 
> 
> open/src/java.security.jgss/share/classes/javax/security 
> open/src/java.security.jgss/share/classes/org/ietf 
> open/src/java.security.jgss/share/classes/sun/security

Mark Powers has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 14 commits:

 - Merge
 - Brad comments
 - Max comments
 - sixth iteration
 - Merge
 - fifth iteration
 - Merge
 - fourth iteration
 - third iteration
 - Merge
 - ... and 4 more: https://git.openjdk.java.net/jdk/compare/1277f5d8...520695f9

-------------

Changes: https://git.openjdk.java.net/jdk/pull/7746/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7746&range=05
  Stats: 932 lines in 73 files changed: 96 ins; 195 del; 641 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7746.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7746/head:pull/7746

PR: https://git.openjdk.java.net/jdk/pull/7746