action: remove redundant action_ prefix from classes

The original names are kept as aliases. The basic module has been changed to
use the new API.
diff --git a/tests/basic.py b/tests/basic.py
index 3fa902b..8bb6b00 100644
--- a/tests/basic.py
+++ b/tests/basic.py
@@ -204,7 +204,7 @@
                logging.info("PKT OUT test with %s, port %s" % (opt, dp_port))
                msg = message.packet_out(in_port=ofp.OFPP_NONE,
                                         data=str(outpkt),
-                                        actions=[action.action_output(port=dp_port)])
+                                        actions=[action.output(port=dp_port)])
 
                logging.info("PacketOut to: " + str(dp_port))
                self.controller.message_send(msg)
@@ -254,7 +254,7 @@
                dp_ports = of_ports[0:num_ports]
                logging.info("PKT OUT test with " + opt +
                                  ", ports " + str(dp_ports))
-               actions = [action.action_output(port=port) for port in dp_ports]
+               actions = [action.output(port=port) for port in dp_ports]
                msg = message.packet_out(in_port=ofp.OFPP_NONE,
                                         data=str(outpkt),
                                         actions=actions)