RFR: 377: Remove special handling of failed-auto-merge label

[Erik Helin]

Hi all,

please review this patch that makes merge pull requests created by the
openjdk-bot to get the proper "RFR:" prefix. The pull requests generated by the
bot are as real as any other pull request ��

Thanks,
Erik

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Commit messages:
 - skara-377

Changes: https://git.openjdk.java.net/skara/pull/597/files
 Webrev: https://webrevs.openjdk.java.net/skara/597/webrev.00
  Issue: https://bugs.openjdk.java.net/browse/SKARA-377
  Stats: 2 lines in 1 file changed: 0 ins; 2 del; 0 mod
  Patch: https://git.openjdk.java.net/skara/pull/597.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/597/head:pull/597

PR: https://git.openjdk.java.net/skara/pull/597