RFR: 1902: Log response code when response body cannot be parsed [v2]

[Erik Joelsson]

> This patch adds better logging of response status codes when things fail.

Erik Joelsson 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 three additional commits since the last revision:

 - Improve logging of UncheckedRestException in BotRunner
 - Merge branch 'master' into SKARA-1902-status-code-json
 - SKARA-1902

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Changes:
  - all: https://git.openjdk.org/skara/pull/1514/files
  - new: https://git.openjdk.org/skara/pull/1514/files/7a480353..42472474

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=skara&pr=1514&range=01
 - incr: https://webrevs.openjdk.org/?repo=skara&pr=1514&range=00-01

  Stats: 735 lines in 37 files changed: 588 ins; 38 del; 109 mod
  Patch: https://git.openjdk.org/skara/pull/1514.diff
  Fetch: git fetch https://git.openjdk.org/skara.git pull/1514/head:pull/1514

PR: https://git.openjdk.org/skara/pull/1514