Allow to raise BooleanQuery limit in gerrit.config.

Raising the limit avoids failing a query BooleanQuery.TooManyClauses,
preventing users from seeing "400 cannot create query for index" error
in the "Conflicts with" part of the change screen.

Change-Id: Ie0bf14c4a3e6c4833c064f7ac822c08aa2aaffb8
Update replication plugin to latest revision

- Prevent creating repos on extra servers
- Remove unneeded 'throws NoSuchChangeException'

Change-Id: I8b1452e252fad58c41e6fe152f44aafc7537d4d7
Merge "Allow to raise BooleanQuery limit in gerrit.config." into stable-2.9
Merge "Update replication plugin to latest revision" into stable-2.9