RFR: csr: add logging

[Erik Helin]

Hi all,

please review this small patch that adds some additional logging to the CSR bot.

Testing:
- `make test` passes on Linux x64

Thanks,
Erik

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Commit messages:
 - csr: add logging

Changes: https://git.openjdk.java.net/skara/pull/503/files
 Webrev: https://webrevs.openjdk.java.net/skara/503/webrev.00
  Stats: 18 lines in 1 file changed: 14 ins; 1 del; 3 mod
  Patch: https://git.openjdk.java.net/skara/pull/503.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/503/head:pull/503

PR: https://git.openjdk.java.net/skara/pull/503