[server/test] make test filename uniques To avoid these pytest error when collecting the whole test suite: import file mismatch: imported module 'unittest_utils' has this __file__ attribute: cubicweb/cubicweb/server/test/unittest_utils.py which is not the same as the test file we want to collect: cubicweb/cubicweb/test/unittest_utils.py Move cubicweb/server/test/unittest_security.py to cubicweb/server/test/unittest_security.py and cubicweb/test/unittest_utils.py to cubicweb/test/unittest_server_utils.py