[Brightcove] support bostonglobe.com's use

BrightcoveNewIE.extract_urls(): Handle player data when it is all in
attributes of the <video> tag, and also the id is
data-brightcove-video-id not data-video-id.

Add test to generic extractor, note HEAD gives 404, no checksum computed(?).

youtube_dl/extractor/brightcove.py

@@ -508,7 +508,22 @@ class BrightcoveNewIE(InfoExtractor):
                 'http://players.brightcove.net/%s/%s_%s/index.html?videoId=%s'
                 % (account_id, player_id, embed, video_id))
 
-        return entries
+# 	<video data-brightcove-video-id="5320421710001" data-account="245991542" data-player="SJWAiyYWg" data-embed="default" class="video-js" controls itemscope itemtype="http://schema.org/VideoObject">
+        for video_id, account_id, player_id, embed in re.findall(
+                r'''(?sx)
+                    <video[^>]+
+                        data-brightcove-video-id=["\'](\d+|ref:[^"\']+)["\'].*?
+                        data-account=["\'](\d+)["\'].*?
+                        data-player=["\'](\w+)["\'].*?
+                        data-embed=["\'](\w+)["\'].*?
+                    </video>
+                ''', webpage):
+            entries.append(
+                'http://players.brightcove.net/%s/%s_%s/index.html?videoId=%s'
+                % (account_id, player_id, embed, video_id))
+
+
+	return entries
 
     def _real_extract(self, url):
         account_id, player_id, embed, video_id = re.match(self._VALID_URL, url).groups()

youtube_dl/extractor/generic.py

@@ -447,6 +447,28 @@ class GenericIE(InfoExtractor):
                 },
             }],
         },
+        {
+            # Brightcove with metadata on one line
+            'url': 'http://www.bostonglobe.com/metro/2017/02/11/tree-finally-succumbs-disease-leaving-hole-neighborhood/h1b4lviqzMTIn9sVy8F3gP/story.html?',
+            'info_dict': {
+                'id': 'story',
+                'title': 'A tree finally succumbs to disease, leaving a hole in a neighborhood - The Boston Globe',
+            },
+            'playlist': [{
+                'info_dict': {
+                    'id': '5320421710001',
+                    'ext': 'mp4',
+                    'title': 'A tree finally succumbs to disease, leaving a hole in a neighborhood',
+                    'description': 'It arrived as a sapling when the Back Bay was in its infancy, a spindly American elm tamped down into a square of dirt cut into the brick sidewalk of 1880s Marlborough Street, no higher than the first bay window of the new brownstone behind it.',
+                    'timestamp': 1486877593,
+                    'upload_date': '20170212',
+                    'uploader_id': '245991542',
+                },
+            }],
+            # HEAD requests produce 404 :(
+            'expected_warnings': ['404'],
+
+        },
         # ooyala video
         {
             'url': 'http://www.rollingstone.com/music/videos/norwegian-dj-cashmere-cat-goes-spartan-on-with-me-premiere-20131219',