RFR: 1806: Optimize the CSR progress message and log when CSR not found [v2]

[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.

Zhao Song has updated the pull request incrementally with one additional commit since the last revision:

  refactor

-------------

Changes:
  - all: https://git.openjdk.org/skara/pull/1463/files
  - new: https://git.openjdk.org/skara/pull/1463/files/ace7fdc0..aef642f2

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=skara&pr=1463&range=01
 - incr: https://webrevs.openjdk.org/?repo=skara&pr=1463&range=00-01

  Stats: 37 lines in 1 file changed: 9 ins; 5 del; 23 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