RFR: JDK-8285504 Minor cleanup could be done in javax.net [v4]

[Mark Powers]

> https://bugs.openjdk.java.net/browse/JDK-8285504
> 
> 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.base/share/classes/java/net

Mark Powers has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains eight additional commits since the last revision:

 - Merge
 - Max and Brad comments
 - jaikiran comments
 - Alan Bateman comments
 - second iteration
 - Merge
 - Merge
 - first iteration

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/8384/files
  - new: https://git.openjdk.java.net/jdk/pull/8384/files/7624f4a9..6997837f

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=8384&range=03
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=8384&range=02-03

  Stats: 12840 lines in 345 files changed: 9325 ins; 1407 del; 2108 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8384.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8384/head:pull/8384

PR: https://git.openjdk.java.net/jdk/pull/8384