Compatibility testing between 7.1.4 and Balch - 7.3.0.

Some customers are currently running on 7.1.4 and will upgrade directly to Balch - 7.3.0.
That's why we need to make an explicit compatibility testing for this kind of upgrade.

Following the test plan
https://github.com/owncloud/QA/blob/master/Server/Test_Plan_OCIS_Compatibility_Test.md