RFR: Treat Jira 4xx errors different from 5xx

[Robin Westberg]

Hi all,

Please review this small change that considers all 4xx errors returned from Jira as permanent (issue not found) errors, while 5xx errors may go away if the operation is retried.

Best regards,
Robin

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Commits:
 - 304cee82: Treat 4xx errors different from 5xx

Changes: https://git.openjdk.java.net/skara/pull/261/files
 Webrev: https://webrevs.openjdk.java.net/skara/261/webrev.00
  Stats: 4 lines in 1 file changed: 3 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/skara/pull/261.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/261/head:pull/261

PR: https://git.openjdk.java.net/skara/pull/261