Test control tables

Created by: gabrielfedel

Include tests for control tables. Part of these tests will fail with current version (the tests related to the special mode). The test will work correctly with new PR - https://bitbucket.org/europeanspallationsource/m-epics-sis8300llrf/pull-requests/12

This tests are implemented in a python script without extra modules (just standard). Python was used because the use of float numbers. The python scripts are not in the best organization, but if this approach is approved I can improve the organization and maybe use petenv (suggested by Control System verification document).