CR-1777-OPENDJ - Upgrade code cleanup
- The upgrade context is now set in the CLI.
- The upgrade context contains now the callback handler
which simplify all the function (removed all calls to callbackhandler, functions just need the context at this point).
- The context contains the CLI user selected options
which simplify the code, removed the CheckCLIUserOption, the task have just to check the context for those parameters.
- Removed the useless VerificationCallback.java
- Added a TaskType in UpgradeTask.java.
- Added function verifyTaskType in UpgradeTasks.java which verify user selected options are correct.
- Modified tools.properties message numbers