Selenium - fix transient history in test_saved_histories related to fetching history names.

xref https://jenkins.galaxyproject.org/job/selenium/588/artifact/588-test-errors/test_delete_and_undelete_history2017092415231506281014/stacktrace.txt

test/selenium_tests/test_saved_histories.py

@@ -1,6 +1,7 @@
 import time
 
 from .framework import (
+    retry_during_transitions,
     retry_assertion_during_transitions,
     selenium_test,
     SharedStateSeleniumTestCase,
@@ -254,8 +255,9 @@ class SavedHistoriesTestCase(SharedStateSeleniumTestCase):
         else:
             self.assertEqual(intersection, set())
 
+    @retry_during_transitions
     def get_histories(self):
-        time.sleep(1.5)
+        time.sleep(.5)
         names = []
         grid = self.wait_for_selector('#grid-table-body')
         for row in grid.find_elements_by_tag_name('tr'):