[tests/python] Reindent test_base_estimator.py

tests/python/test_base_estimator.py

 import sot_talos_balance.talos.parameter_server_conf as param_server_conf
-from sot_talos_balance.create_entities_utils import Bunch, Example, TalosBaseEstimator, create_parameter_server
+from sot_talos_balance.create_entities_utils import Bunch, Example,\
+          TalosBaseEstimator, create_parameter_server
 
 dt = 0.001
 conf = Bunch()