Fix imports and general cleanup

· Import from compat what comes from compat. Yes, some names are available in utils too, but that's an implementation detail.
· Use _match_id consistently whenever possible
· Fix some outdated tests
· Use consistent valid URL (always match the whole protocol, no ^ at start required)
· Use modern test definitions

youtube_dl/extractor/noco.py

@@ -6,13 +6,15 @@ import time
 import hashlib
 
 from .common import InfoExtractor
-from ..utils import (
-    compat_urllib_request,
-    compat_urllib_parse,
-    ExtractorError,
-    clean_html,
-    unified_strdate,
+from ..compat import (
     compat_str,
+    compat_urllib_parse,
+    compat_urllib_request,
+)
+from ..utils import (
+    clean_html,
+    ExtractorError,
+    unified_strdate,
 )