Gerrit with WANdisco replication - RELEASE_6.6.0-WDv1.1

Prelude
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JGit with WANdisco replication

New Features
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- Add reno
- Upgrade log4j2 from 2.14.0 -> 2.17.2
- Upgrade commons-compress 1.20 -> 1.21
- Upgrade junit from 4.12 -> 4.13.2

Change-Id: Ic9f2b9002e6260570871dd9f567a3502153675ac