Catch KeyboardInterrupt

When a user Ctrl-C's the client, this will cause a short message to
be printed rather than an ugly backtrace.

This will not catch all instances of this (can still Ctrl-C before
reaching this code, etc.), but it should catch most of them, and those
for long-running sessions.

The specific message was chosen to match one recently added to the
glance client.

Change-Id: Ib748835ad1f94fb901b4941dc5e3797b719e197f

cinderclient/shell.py

@@ -487,7 +487,9 @@ class OpenStackHelpFormatter(argparse.HelpFormatter):
 def main():
     try:
         OpenStackCinderShell().main(sys.argv[1:])
-
+    except KeyboardInterrupt:
+        print >> sys.stderr, "... terminating cinder client"
+        sys.exit(130)
     except Exception, e:
         logger.debug(e, exc_info=1)
         print >> sys.stderr, "ERROR: %s" % e.message