Handling KeyboardInterrupt in Burrow shell

[Varadharajan Mukundan]

When a keyboard interrupt(for example : CTRL + C) is given as an input to the burrow shell, an exception is thrown. It would be better if the exception is caught and handled.

varadharajan@unisys-67:/tmp/burrow-2011.2/burrow$ python shell.py
2011-07-20 16:28:14,142 - burrow.backend.http - DEBUG - Module created
burrow> Traceback (most recent call last):
  File "shell.py", line 243, in <module>
    Shell().run()
  File "shell.py", line 114, in run
    for command in self._get_command():
  File "shell.py", line 133, in _get_command
    command = raw_input(prompt)
KeyboardInterrupt

[Varadharajan Mukundan (srinathsmn)]

The above patch when integrated would make the shell exit when a keyboard interrupt is given, after printing out a message regarding it