Changed unit tests for settings.py

navix/settings.py

test_it.py

tests/Test_settings.py

tests/test_configs/expected_log_empty_known_servers_file.txt

...st_configs/expected_log_no_htcondor_bindings_cnf_file.txt

...s/test_configs/expected_log_no_known_servers_cnf_file.txt

tests/test_configs/expected_log_no_navix_cnf_file.txt