Move compat import to supervisor.compat with all the others

Author: mnaberez

supervisor/compat.py

@@ -105,3 +105,8 @@ def is_text_stream(stream):
     import thread
 except ImportError: # pragma: no cover
     import _thread as thread
+
+try: # pragma: no cover
+    from html import escape
+except ImportError: # pragma: no cover
+    from cgi import escape

supervisor/medusa/util.py

@@ -1,10 +1,4 @@
-from supervisor.compat import PY2
-
-if PY2:
-    from cgi import escape
-else:
-    from html import escape
-
+from supervisor.compat import escape
 
 def html_repr (object):
     so = escape (repr (object))