Fix reraising of exceptions

Exceptions should be reraised with just "raise" and not "raise e" to
preserve the traceback. This also addresses a couple cases where the
catching and reraising of the exception was not actually doing anything.

Change-Id: I94ba193f728ee7ca6f689f70fc08317a1dd50c92
Signed-off-by: Sean McGinnis <sean.mcginnis@gmail.com>

watcher/decision_engine/goal/efficacy/indicators.py

@@ -59,7 +59,7 @@ class IndicatorSpecification(object):
             jsonschema.validate(value, cls.schema)
         except (SchemaError, ValidationError) as exc:
             LOG.exception(exc)
-            raise exc
+            raise
         except Exception as exc:
             LOG.exception(exc)
             raise exception.InvalidIndicatorValue(