Enabled back turned off Video acceptance tests.

Updated comments.

BLD-537

cms/djangoapps/contentstore/features/video.feature

@@ -53,33 +53,36 @@ Feature: CMS.Video Component
     Then Captions become "invisible"
 
   # 8
-  # Disabled 11/26 due to flakiness in master
-  #Scenario: Open captions never become invisible
-  #  Given I have created a Video component with subtitles
-  #  And Make sure captions are open
-  #  Then Captions are "visible"
-  #  And I hover over button "CC"
-  #  Then Captions are "visible"
-  #  And I hover over button "volume"
-  #  Then Captions are "visible"
+  # Disabled 11/26 due to flakiness in master.
+  # Enabled back on 11/29.
+  Scenario: Open captions never become invisible
+    Given I have created a Video component with subtitles
+    And Make sure captions are open
+    Then Captions are "visible"
+    And I hover over button "CC"
+    Then Captions are "visible"
+    And I hover over button "volume"
+    Then Captions are "visible"
 
   # 9
-  # Disabled 11/26 due to flakiness in master
-  #Scenario: Closed captions are invisible when mouse doesn't hover on CC button
-  #  Given I have created a Video component with subtitles
-  #  And Make sure captions are closed
-  #  Then Captions become "invisible"
-  #  And I hover over button "volume"
-  #  Then Captions are "invisible"
+  # Disabled 11/26 due to flakiness in master.
+  # Enabled back on 11/29.
+  Scenario: Closed captions are invisible when mouse doesn't hover on CC button
+    Given I have created a Video component with subtitles
+    And Make sure captions are closed
+    Then Captions become "invisible"
+    And I hover over button "volume"
+    Then Captions are "invisible"
 
   # 10
-  # Disabled 11/26 due to flakiness in master
-  #Scenario: When enter key is pressed on a caption shows an outline around it
-  #  Given I have created a Video component with subtitles
-  #  And Make sure captions are opened
-  #  Then I focus on caption line with data-index "0"
-  #  Then I press "enter" button on caption line with data-index "0"
-  #  And I see caption line with data-index "0" has class "focused"
+  # Disabled 11/26 due to flakiness in master.
+  # Enabled back on 11/29.
+  Scenario: When enter key is pressed on a caption shows an outline around it
+    Given I have created a Video component with subtitles
+    And Make sure captions are opened
+    Then I focus on caption line with data-index "0"
+    Then I press "enter" button on caption line with data-index "0"
+    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