[ConsoleUI] remove `deferred` being returned after command

A `return` statement was added in ece31cf for unit testing to work but
this resulted in Deferred printed in console output.

Added a test_start entry point to return the required deferreds while
removing the return from original start entrypoint.

Closes: https://dev.deluge-torrent.org/ticket/3582
Closes: https://github.com/deluge-torrent/deluge/pull/408

deluge/tests/test_ui_entry.py

@@ -416,7 +416,7 @@ class TestConsoleScriptEntryWithDaemon(BaseTestCase, ConsoleUIWithDaemonBaseTest
     def set_var(self, request):
         request.cls.var = {
             'cmd_name': 'deluge-console',
-            'start_cmd': deluge.ui.console.start,
+            'start_cmd': deluge.ui.console.test_start,
             'sys_arg_cmd': ['./deluge-console'],
         }
 

deluge/ui/console/__init__.py

@@ -12,5 +12,13 @@ UI_PATH = __path__[0]
 
 
 def start():
+    Console().start()
 
+
+def test_start():
+    """Entry point for tests
+
+    A workaround for unit tests which require a deferred object to be
+    returned to run properly due to mocking the Twisted reactor.
+    """
     return Console().start()