Minor Python cleanups to make flake8 pass with the new rules enabled

test/functional/feature_proxy.py

@@ -182,7 +182,7 @@ class ProxyTest(BitcoinTestFramework):
         assert_equal(n1['onion']['proxy'], '%s:%i' % (self.conf2.addr))
         assert_equal(n1['onion']['proxy_randomize_credentials'], False)
         assert_equal(n1['onion']['reachable'], True)
-        
+
         n2 = networks_dict(self.nodes[2].getnetworkinfo())
         for net in ['ipv4','ipv6','onion']:
             assert_equal(n2[net]['proxy'], '%s:%i' % (self.conf2.addr))