RFR: checkout: refine logging levels

[Erik Helin]

Hi all,

please review this small patch that refines the logging levels for the `checkout` bot.

Thanks,
Erik

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Commit messages:
 - checkout: refine logging levels

Changes: https://git.openjdk.java.net/skara/pull/987/files
 Webrev: https://webrevs.openjdk.java.net/?repo=skara&pr=987&range=00
  Stats: 14 lines in 3 files changed: 5 ins; 0 del; 9 mod
  Patch: https://git.openjdk.java.net/skara/pull/987.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/987/head:pull/987

PR: https://git.openjdk.java.net/skara/pull/987