Remove DateDiff properties as they are not used anymore.
chore(qa): remove patch current version from db upgrade test

- assuming the upgrade script already contains all patches they
  should not be executed again

related to #CAM-2662
Merge pull request #107 from langfr/Remove_DateDiff

chore (engine): remove DateDiff properties as they are not used anymore
fix(qa): remove error-prone deployment by http client

- the deployment seems to be error-prone for glassfish
  which leads to other problems during our CI

related to #CAM-2647