[Tests] Fix 'Too many open files' by disabling LSD

Instances of libtorrent with Local Service Discovery enabled are leaving
many sockets fd open with every test run and will fail with 'Too many files
open' if ulimit is >=1024.

deluge/tests/test_alertmanager.py

@@ -17,6 +17,7 @@ class AlertManagerTestCase(BaseTestCase):
 
     def set_up(self):
         self.core = Core()
+        self.core.config.config['lsd'] = False
         self.am = component.get('AlertManager')
         return component.start(['AlertManager'])
 

deluge/tests/test_core.py

@@ -85,6 +85,7 @@ class CoreTestCase(BaseTestCase):
         common.set_tmp_config_dir()
         self.rpcserver = RPCServer(listen=False)
         self.core = Core()
+        self.core.config.config['lsd'] = False
         self.listen_port = 51242
         return component.start().addCallback(self.start_web_server)
 

deluge/tests/test_torrent.py

@@ -39,6 +39,7 @@ class TorrentTestCase(BaseTestCase):
         self.setup_config()
         self.rpcserver = RPCServer(listen=False)
         self.core = Core()
+        self.core.config.config['lsd'] = False
         self.session = lt.session()
         self.torrent = None
         return component.start()

deluge/tests/test_torrentmanager.py

@@ -31,6 +31,7 @@ class TorrentmanagerTestCase(BaseTestCase):
         common.set_tmp_config_dir()
         self.rpcserver = RPCServer(listen=False)
         self.core = Core()
+        self.core.config.config['lsd'] = False
         return component.start()
 
     def tear_down(self):