Refactors application tests
* Extracts all environment setup in a new external class in order to
make it more reusable (for example reuse those environments for
integration tests)
* Replaces CHER prefix bu CHE.
* Adds '@SuppressWarnings("nls")' in test classes.
* Removes useless code.
Change-Id: I24b11ec79479babb9929960149c9db550643ad31