Return 130 for keyboard interrupt

When keyboard interrupt is received by glanceclient, the return code as
of now is 1.

But since the client was terminated by an keyboard interrupt, the return
code should be 130. (http://tldp.org/LDP/abs/html/exitcodes.html)
It is useful when people are writing automation test cases and want to
validate based on the return code.

Change-Id: Ia70116ab6f0708a0ce6eeaed07c1e7a56e68c9f4
Closes-Bug: #1373231

glanceclient/shell.py

@@ -697,6 +697,6 @@ def main():
     try:
         OpenStackImagesShell().main(map(encodeutils.safe_decode, sys.argv[1:]))
     except KeyboardInterrupt:
-        utils.exit('... terminating glance client')
+        utils.exit('... terminating glance client', exit_code=130)
     except Exception as e:
         utils.exit(utils.exception_to_str(e))