Delete running jobs after each API-style test

Should prevent https://jenkins.galaxyproject.org/job/docker-integration-py3/159/testReport/junit/test.integration.test_upload_configuration_options/AdminsCanPasteFilePathsTestCase/test_admin_path_paste_libraries/

test/base/api.py

@@ -1,3 +1,4 @@
+import os
 from contextlib import contextmanager
 
 from six.moves.urllib.parse import urlencode
@@ -22,6 +23,12 @@ from .testcase import FunctionalTestCase
 
 class UsesApiTestCaseMixin(object):
 
+    def tearDown(self):
+        if os.environ.get('GALAXY_TEST_EXTERNAL') is None:
+            # Only kill running jobs after test for managed test instances
+            for job in self.galaxy_interactor.get('jobs?state=running&?user_details=true').json():
+                self._delete("jobs/%s" % job['id'])
+
     def _api_url(self, path, params=None, use_key=None, use_admin_key=None):
         if not params:
             params = {}