Fix: timmy exits 0 on unhandled exceptions

Change-Id: I734b3ba22c7e9ddfd3f8621cd3925a87f5130cf4

doc/source/exitcodes.rst

@@ -16,3 +16,4 @@ Exit Codes
 * `110` - unable to create a directory.
 * `111` - ip address must be defined for Node instance.
 * `112` - one of the two parameters **fuel_user** or **fuel_pass** specified without the other.
+* `113` - unhandled Python exception occured in main process.

timmy/tools.py

@@ -62,6 +62,7 @@ def interrupt_wrapper(f):
                 if not k.startswith('__') and k != 'message':
                     v = getattr(e, k)
                     logger.debug('Error details: %s = %s' % (k, v))
+            sys.exit(113)
     return wrapper