[skara] RFR: pr: add CommitCommandWorkItem.toString

[Erik Helin]

Hi all,

please review this small patch that overrides `toString` for `CommitCommandWorkItem`.

Thanks,
Erik

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Commit messages:
 - pr: add CommitCommandWorkItem.toString

Changes: https://git.openjdk.java.net/skara/pull/1069/files
 Webrev: https://webrevs.openjdk.java.net/?repo=skara&pr=1069&range=00
  Stats: 5 lines in 1 file changed: 5 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/skara/pull/1069.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/1069/head:pull/1069

PR: https://git.openjdk.java.net/skara/pull/1069