Fix flaky video tests: speed up youtube api loading and wait for controls.

cms/djangoapps/contentstore/features/video.feature

@@ -5,7 +5,7 @@ Feature: CMS Video Component
   # 1
   Scenario: YouTube stub server proxies YouTube API correctly
     Given youtube stub server proxies YouTube API
-    Given I have created a Video component
+    And I have created a Video component
     Then I can see video button "play"
     And I click video button "play"
     Then I can see video button "pause"
@@ -13,8 +13,8 @@ Feature: CMS Video Component
   # 2
   Scenario: YouTube stub server can block YouTube API
     Given youtube stub server blocks YouTube API
-    Given I have created a Video component
-    Given We explicitly wait for YouTube API to not load
+    And I have created a Video component
+    And I wait for "3" seconds
     Then I do not see video button "play"
 
   # 3

cms/djangoapps/contentstore/features/video.py

@@ -1,6 +1,7 @@
 # pylint: disable=C0111
 
 from lettuce import world, step
+from nose.tools import assert_less
 from xmodule.modulestore import Location
 from contentstore.utils import get_modulestore
 from selenium.webdriver.common.keys import Keys
@@ -32,13 +33,11 @@ def configure_youtube_api(_step, action):
         raise ValueError('Parameter `action` should be one of "proxies" or "blocks".')
 
 
-@step('We explicitly wait for YouTube API to not load$')
-def wait_for_youtube_api_fail(_step):
-    world.wait(3)
-
-
 @step('I have created a Video component$')
 def i_created_a_video_component(_step):
+
+    assert_less(world.youtube.config['youtube_api_response'].status_code, 400,  "Real Youtube server is unavailable")
+
     world.create_course_with_unit()
     world.create_component_instance(
         step=_step,
@@ -51,7 +50,8 @@ def i_created_a_video_component(_step):
     world.wait_for_present('.is-initialized')
     world.wait(DELAY)
     world.wait_for_invisible(SELECTORS['spinner'])
-
+    if not world.youtube.config.get('youtube_api_blocked'):
+        world.wait_for_visible(SELECTORS['controls'])
 
 @step('I have created a Video component with subtitles$')
 def i_created_a_video_with_subs(_step):