RFR: 1806: Optimize the CSR progress message and log when CSR not found

[Zhao Song]

A user reported that she have a PR which can't find its corresponding CSR. 
Erik found that the issue was caused by the user not updating their branch in a long time, and the fixVersion in the .jcheck/conf file was still set at 20. However, the fixVersion of the CSR was 21, make the bot unable to locate the corresponding CSR. 

In this patch, I optimized the CSR progress message and log.

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Commit messages:
 - SKARA-1806

Changes: https://git.openjdk.org/skara/pull/1463/files
 Webrev: https://webrevs.openjdk.org/?repo=skara&pr=1463&range=00
  Issue: https://bugs.openjdk.org/browse/SKARA-1806
  Stats: 37 lines in 3 files changed: 4 ins; 0 del; 33 mod
  Patch: https://git.openjdk.org/skara/pull/1463.diff
  Fetch: git fetch https://git.openjdk.org/skara pull/1463/head:pull/1463

PR: https://git.openjdk.org/skara/pull/1463