Namespace and modularize nucypher sandbox utilities

nucypher/utilities/sandbox/middleware.py

@@ -3,7 +3,6 @@ import os
 from apistar import TestClient
 
 from nucypher.characters.lawful import Ursula
-from nucypher.crypto.api import load_tls_certificate
 from nucypher.network.middleware import RestMiddleware
 from nucypher.utilities.sandbox.constants import TEST_KNOWN_URSULAS_CACHE
 
@@ -50,7 +49,6 @@ class MockRestMiddleware(RestMiddleware):
         id_as_hex = work_order.arrangement_id.hex()
 
         assert os.path.exists(work_order.ursula.certificate_filepath), 'TLS Certificate does not exist on the filesystem'
-
         return mock_client.post('http://localhost/kFrag/{}/reencrypt'.format(id_as_hex), payload)
 
     def get_treasure_map_from_node(self, node, map_id):

nucypher/utilities/sandbox/ursula.py

@@ -32,6 +32,7 @@ def make_federated_ursulas(ursula_config,
         federated_ursulas.add(ursula)
 
         # Store this Ursula in our global testing cache.
+
         port = ursula.rest_information()[0].port
         TEST_KNOWN_URSULAS_CACHE[port] = ursula
 
@@ -67,6 +68,7 @@ def make_decentralized_ursulas(ursula_config,
                                        rest_port=port + 100,
                                        **ursula_overrides)
 
+
         if stake is True:
 
             min_stake, balance = int(constants.MIN_ALLOWED_LOCKED), ursula.token_balance