Disable test seen to fail on PRs

cms/djangoapps/contentstore/features/video.feature

@@ -79,18 +79,19 @@ Feature: CMS.Video Component
     And I see caption line with data-index 0 has class "focused"
 
   # 11
-  Scenario: When start end end times are specified, a range on slider is shown
-    Given I have created a Video component
-    And Make sure captions are closed
-    And I edit the component
-    And I open tab "Advanced"
-    And I set value "12" to the field "Start Time"
-    And I set value "24" to the field "End Time"
-    And I save changes
-    And I click video button "Play"
+  # Disabled until we come up with a more solid test, as this one is brittle.
+  # Scenario: When start end end times are specified, a range on slider is shown
+  #   Given I have created a Video component
+  #   And Make sure captions are closed
+  #   And I edit the component
+  #   And I open tab "Advanced"
+  #   And I set value "12" to the field "Start Time"
+  #   And I set value "24" to the field "End Time"
+  #   And I save changes
+  #   And I click video button "Play"
 
     # The below line is a bit flaky. Numbers 73 and 73 were determined rather
     # accidentally. They might change in the future as Video player gets CSS
     # updates. If this test starts failing, 99.9% cause of failure is the line
     # below.
-    Then I see a range on slider with styles "left" set to 73 px and "width" set to 73 px
+    # Then I see a range on slider with styles "left" set to 73 px and "width" set to 73 px