RFR: 2466: Cut down list of other commits from 10 to 3

[Magnus Ihse Bursie]

Skara prints a list of other commits that has been integrated before a PR is automatically rebased. I think the idea was to put transparency to the rebasing process, but in actuality it only adds noise.

I think it could be removed entirely (in general, I think the Skara bot messages are *waaaay* to chatty), but as a start, it the list could be shortened radically. I chose 3 as the lowest number that is still a "crowd".

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Commit messages:
 - 2466: Cut down list of other commits from 10 to 3

Changes: https://git.openjdk.org/skara/pull/1710/files
  Webrev: https://webrevs.openjdk.org/?repo=skara&pr=1710&range=00
  Issue: https://bugs.openjdk.org/browse/SKARA-2466
  Stats: 9 lines in 2 files changed: 2 ins; 0 del; 7 mod
  Patch: https://git.openjdk.org/skara/pull/1710.diff
  Fetch: git fetch https://git.openjdk.org/skara.git pull/1710/head:pull/1710

PR: https://git.openjdk.org/skara/pull/1710