Remove uuid workaround for older Pythons

uuid is available on all Python versions supported by psycopg2.

tests/testutils.py

@@ -203,11 +203,6 @@ def skip_if_no_uuid(f):
     """Decorator to skip a test if uuid is not supported by Py/PG."""
     @wraps(f)
     def skip_if_no_uuid_(self):
-        try:
-            import uuid             # noqa
-        except ImportError:
-            return self.skipTest("uuid not available in this Python version")
-
         try:
             cur = self.conn.cursor()
             cur.execute("select typname from pg_type where typname = 'uuid'")