ULG PATCH: BIRD: Fix timeout in case ip/subnet is not in the routing table

[Frederik Kriewitz]

Fixes exceptions like this:
ERROR: Exception occured while running a command:Traceback (most recent
call last):
  File "/var/www/html/ulg.py", line 498, in commandThreadBody
    session.getRouter().runAsyncCommand(session.getCommand(),session.getParameters(),FakeSessionFile(session))
  File "/var/www/html/ulgmodel.py", line 463, in runAsyncCommand
    return self.runRawCommand(c,outfile)
  File "/var/www/html/ulgbird.py", line 544, in runRawCommand
    l = sf.readline()
  File "/usr/lib/python2.7/socket.py", line 447, in readline
    data = self._sock.recv(self._rbufsize)
timeout: timed out
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