RFR: 8286293: Tests ShortResponseBody and ShortResponseBodyWithRetry should use less resources [v2]

[Daniel Fuchs]

> Hi,
> 
> Please find here a simple test fix that re-architecture ShortResponseBody for better resource usage.
> The test is split to test GET and POST separately and avoids testing GET twice.

Daniel Fuchs 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 two additional commits since the last revision:

 - Merge branch 'master' into ShortResponseBody
 - 8286293: Tests ShortResponseBody and ShortResponseBodyWithRetry should use less resources

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/8569/files
  - new: https://git.openjdk.java.net/jdk/pull/8569/files/b212c007..11959ee8

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=8569&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=8569&range=00-01

  Stats: 109734 lines in 1343 files changed: 97735 ins; 5210 del; 6789 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8569.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8569/head:pull/8569

PR: https://git.openjdk.java.net/jdk/pull/8569