rake system_tests freezes in CI

Times out at 5 mintues.

tests.py::test_users_management[ubuntu/18.04-centos/8] 
************ START   tests.py::test_users_management[ubuntu/18.04-centos/8] **************************************************************
FAILED
************ RESULT FAILED   tests.py::test_users_management[ubuntu/18.04-centos/8]  took 0:05:00  ****************************************