RFR: 217: Enforce check on number of required reviewers

[Robin Westberg]

Hi all,

Please review this change that allows Reviewers of a PR to override the default number of required reviews as configured in the jcheck configuration file.

Best regards,
Robin

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Commits:
 - 6a6b9253: Initial implementation

Changes: https://git.openjdk.java.net/skara/pull/364/files
 Webrev: https://webrevs.openjdk.java.net/skara/364/webrev.00
  Issue: https://bugs.openjdk.java.net/browse/SKARA-217
  Stats: 403 lines in 11 files changed: 385 ins; 0 del; 18 mod
  Patch: https://git.openjdk.java.net/skara/pull/364.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/364/head:pull/364

PR: https://git.openjdk.java.net/skara/pull/364