Fix mysql recipe
Update gerrit version form 2.8.3 to 2.8.5
Merge pull request #1 from gsilantyev/dev

Fix gerrit::mysql recipe (mysql::default obsoleted), update gerrit version from 2.8.3 to 2.8.6 (current stable version)
Merge branch 'gsilantyev-master'

* gsilantyev-master:
  Update gerrit version form 2.8.3 to 2.8.5
  Fix mysql recipe