php5-json is provided by php5-common

Including it here makes us think we keep installing it.

Change-Id: I4ce85648de9c688bd62c8bb95c4246de4fd07297
Stop trying to start gerrit every time

We only want to start it when we've installed or upgraded.
The initial-init and init are designed to either one of them run,
one if there is no init script (initial install) the other if there
is (upgrade). The things they trigger should only run in response
to those actions.

Change-Id: I3bcaaed07bcf6239e053789b9b6241cbf652e7d4
Merge "Stop trying to start gerrit every time"
Merge "php5-json is provided by php5-common"