tests: clean up code related to configuration of cloudooo/memcached connectors
- The conversion server is supposed to be configured in a system preference, so do this instead of using a normal preference. - _getConversionServerDict -> _getConversionServerUrl, to make clear that cloudooo is now configured by a url, instead of a host/port couple. - Refactoring: From the moment where setUpERP5Site() sets up things automatically, we don't the "same" duplicated code throughout many test to redo cloudooo configuration. - In the promise file, the volatile/persistent memcached url were swapped.
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