Ensure error exit codes fail integrations

The exit code of sub commands were ignored.  As a result all
integration jobs would pass even when they fail.

Change-Id: I071283d2737199ed710e246740f68f8e857027f2
Closes-Bug: #1546772

bandit/core/manager.py

@@ -144,9 +144,9 @@ class BanditManager():
                         sev_level=sev_level, conf_level=conf_level,
                         lines=lines)
 
-        except Exception:
-            raise RuntimeError("Unable to output report using '%s' formatter."
-                               % output_format)
+        except Exception as e:
+            raise RuntimeError("Unable to output report using '%s' formatter: "
+                               "%s" % (output_format, str(e)))
 
     def discover_files(self, targets, recursive=False, excluded_paths=''):
         '''Add tests directly and from a directory to the test set

scripts/integration-test.sh

@@ -40,7 +40,6 @@ if [[ $clone -eq 1 ]] ; then
 fi
 
 pushd $projectdir
-    set +e
     # --notest allows us to create the tox-managed virtualenv without
     # running any tests.
     tox -e bandit --notest