Include an exception on outer-level failures when running plugins

The traceback will be both in the debug output and within the
Result value for the call so we have half a chance to fix what
is broken.

#224

Signed-off-by: Rob Crittenden <rcritten@redhat.com>

src/ipahealthcheck/core/core.py

@@ -8,6 +8,7 @@
 import pkg_resources
 import signal
 import warnings
+import traceback
 
 from datetime import datetime
 
@@ -61,7 +62,9 @@ def signal_handler(signum, frame):
                      start=start)
     except Exception as e:
         logger.debug('Exception raised: %s', e)
+        logger.debug(traceback.format_exc())
         yield Result(plugin, constants.CRITICAL, exception=str(e),
+                     traceback=traceback.format_exc(),
                      start=start)
     finally:
         signal.alarm(0)