Python Bindings: Fix uncaught exception in 'deadlinesocket'

Python Bindings throws an error if the socket does not provide data:
Traceback (most recent call last):
....
File "/usr/lib/python3/dist-packages/MythTV/utility/other.py", line 374, in dlexpect
raise MythError(MythError.CLOSEDSOCKET)
AttributeError: type object 'MythError' has no attribute 'CLOSEDSOCKET'

Solution:
Align the error code to the methods provided by MythError.SOCKET.

Fixes #423

mythtv/bindings/python/MythTV/utility/other.py

@@ -371,7 +371,7 @@ def dlexpect(self, pattern, flags=0, deadline=None):
                 raise MythError(MythError.SOCKET, e.args)
             if buff.tell() == p:
                 # no data read from a 'ready' socket, connection terminated
-                raise MythError(MythError.CLOSEDSOCKET)
+                raise MythError(MythError.SOCKET, (54, 'Connection reset by peer'))
 
             if timeout == 0:
                 break