RFR: 1166: New Gitlab version is causing "Initial paginated response no longer paginated" errors

[Erik Joelsson]

This patch changes the exception thrown when a paginated rest query suddenly returns a results without pages. Instead of a RuntimeException I'm throwing an UncheckedRestException, which makes the BotRunner treat it as a warning instead of logging SEVERE. The assumption is that this happens randomly, just like other rest call failures, and that most WorkItems will just have to be rerun at a later time.

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Commit messages:
 - SKARA-1166

Changes: https://git.openjdk.java.net/skara/pull/1220/files
 Webrev: https://webrevs.openjdk.java.net/?repo=skara&pr=1220&range=00
  Issue: https://bugs.openjdk.java.net/browse/SKARA-1166
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/skara/pull/1220.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/1220/head:pull/1220

PR: https://git.openjdk.java.net/skara/pull/1220