RFR: 1708: Print more log to investigate SKARA-1707

[Zhao Song]

Now, in method GitLabRepository#fileContents, first, it will try to read the content with once encoded filename, and if failed, it will try to read the content with double encoded filename. However, we don't print the log for the first try, so we couldn't know what happens in the first try.

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Commit messages:
 - SKARA-1708

Changes: https://git.openjdk.org/skara/pull/1432/files
 Webrev: https://webrevs.openjdk.org/?repo=skara&pr=1432&range=00
  Issue: https://bugs.openjdk.org/browse/SKARA-1708
  Stats: 2 lines in 1 file changed: 2 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/skara/pull/1432.diff
  Fetch: git fetch https://git.openjdk.org/skara pull/1432/head:pull/1432

PR: https://git.openjdk.org/skara/pull/1432