RFR: forge: more precise status for GitHub diff

[Erik Helin]

Hi all,

please review this patch that makes the parsing of the `"status"` field from GitHub for diffs more precise.

Thanks,
Erik

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Commit messages:
 - forge: more precise status for GitHub diff

Changes: https://git.openjdk.java.net/skara/pull/917/files
 Webrev: https://webrevs.openjdk.java.net/?repo=skara&pr=917&range=00
  Stats: 18 lines in 1 file changed: 17 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/skara/pull/917.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/917/head:pull/917

PR: https://git.openjdk.java.net/skara/pull/917