RFR: Make the rest request error transform optional

[Robin Westberg]

Hi all,

Please review this change that allows the rest request error transform functional to only transform certain errors, and let the rest be handled as untransformed.

Best regards,
Robin

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Commits:
 - 018d326c: Make the error transform optional

Changes: https://git.openjdk.java.net/skara/pull/468/files
 Webrev: https://webrevs.openjdk.java.net/skara/468/webrev.00
  Stats: 31 lines in 8 files changed: 3 ins; 7 del; 21 mod
  Patch: https://git.openjdk.java.net/skara/pull/468.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/468/head:pull/468

PR: https://git.openjdk.java.net/skara/pull/468