RFR: 627: Review comments are in different order in different e-mails

[Robin Westberg]

Sort review comments by filename and line to make the resulting emails more consistent.

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Commit messages:
 - Sort review comments by file and line

Changes: https://git.openjdk.java.net/skara/pull/1067/files
 Webrev: https://webrevs.openjdk.java.net/?repo=skara&pr=1067&range=00
  Issue: https://bugs.openjdk.java.net/browse/SKARA-627
  Stats: 20 lines in 2 files changed: 12 ins; 0 del; 8 mod
  Patch: https://git.openjdk.java.net/skara/pull/1067.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/1067/head:pull/1067

PR: https://git.openjdk.java.net/skara/pull/1067