VID-1880 fixing a few issues with play video tests

Added some checks to make sure the selected ooyala video actually was age restricted before testing if age gate works. Also added a bandaid fix for age gate intermittently not working when logged out. 
For this particular test, we're going to the special videos page and picking the first video we see there. That first video may or may not have age gate, so this test should have never really worked. 

Actually, I could change the test so it works like the inline test - i.e. it always goes to a page that has an age gate video. Yeah I'll do that.