Correct murano reraising of exception

When an exception was caught and rethrown, it should call 'raise'
without any arguments because it shows the place where an
exception occured initially instead of place where
the exception re-raised 685

Change-Id: I9cf6a8e2b6350eec2e010894b6a27f792e3f4368

cue/common/exception.py

@@ -75,7 +75,7 @@ class CueException(Exception):
             try:
                 message = self.message % kwargs
 
-            except Exception as e:
+            except Exception:
                 # kwargs doesn't match a variable in the message
                 # log the issue and the kwargs
                 LOG.exception(_LE('Exception in string format operation'))
@@ -83,7 +83,7 @@ class CueException(Exception):
                     LOG.error("%s: %s" % (name, value))
 
                 if CONF.fatal_exception_format_errors:
-                    raise e
+                    raise
                 else:
                     # at least get the core message out if something happened
                     message = self.message