[Rev 01] RFR: Add toString methods to all WorkItems

[Erik Helin]

> Hi all,
> 
> please review this small patch that adds proper `toString` implementations to
> all classes implementing `WorkItem` (to get better logging).
> 
> Thanks,
> Erik

The pull request has been updated with 1 additional commit.

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

Added commits:
 - c03d9287: Update bots/mirror/src/main/java/org/openjdk/skara/bots/mirror/MirrorBot.java

Changes:
  - all: https://git.openjdk.java.net/skara/pull/403/files
  - new: https://git.openjdk.java.net/skara/pull/403/files/1f8ffb73..c03d9287

Webrevs:
 - full: https://webrevs.openjdk.java.net/skara/403/webrev.01
 - incr: https://webrevs.openjdk.java.net/skara/403/webrev.00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/skara/pull/403.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/403/head:pull/403

PR: https://git.openjdk.java.net/skara/pull/403