[Lint] Fix pylint signature-differs warning

.pylintrc

@@ -69,7 +69,7 @@ disable=missing-docstring, invalid-name, old-style-class, bad-continuation, wron
     R,
     unused-argument, fixme, protected-access, import-error, unused-variable,
         global-statement, attribute-defined-outside-init, arguments-differ,
-        no-init, non-parent-init-called, super-init-not-called, signature-differs,
+        no-init, non-parent-init-called, super-init-not-called,
         broad-except, pointless-except
 
 [REPORTS]

deluge/core/rpcserver.py

@@ -18,7 +18,7 @@ from types import FunctionType
 
 from OpenSSL import SSL, crypto
 from twisted.internet import defer, reactor
-from twisted.internet.protocol import Factory
+from twisted.internet.protocol import Factory, connectionDone
 
 import deluge.component as component
 import deluge.configmanager
@@ -159,7 +159,7 @@ class DelugeRPCProtocol(DelugeTransferProtocol):
         # Set the initial auth level of this session to AUTH_LEVEL_NONE
         self.factory.authorized_sessions[self.transport.sessionno] = AUTH_LEVEL_NONE
 
-    def connectionLost(self, reason):  # NOQA
+    def connectionLost(self, reason=connectionDone):  # NOQA
         """
         This method is called when the client is disconnected.
 

deluge/ui/gtkui/ipcinterface.py

@@ -18,7 +18,7 @@ from urlparse import urlparse
 
 import twisted.internet.error
 from twisted.internet import reactor
-from twisted.internet.protocol import ClientFactory, Factory, Protocol
+from twisted.internet.protocol import ClientFactory, Factory, Protocol, connectionDone
 
 import deluge.component as component
 from deluge.common import decode_string, is_magnet, is_url, windows_check
@@ -55,7 +55,7 @@ class IPCProtocolClient(Protocol):
         self.transport.write(rencode.dumps(self.factory.args))
         self.transport.loseConnection()
 
-    def connectionLost(self, reason):  # NOQA
+    def connectionLost(self, reason=connectionDone):  # NOQA
         reactor.stop()
         self.factory.stop = True