event: remove opal_async_event_base

opal_async_event_base is not used anywhere.  The opal_progress_thread
API should be used instead.

(cherry picked from commit open-mpi/ompi@9e1e563)

Author: jsquyres

opal/mca/event/base/event_base_frame.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2010      Cisco Systems, Inc.  All rights reserved.
+ * Copyright (c) 2010-2015 Cisco Systems, Inc.  All rights reserved.
  * Copyright (c) 2014-2015 Intel, Inc. All rights reserved.
  * $COPYRIGHT$
  *
@@ -65,7 +65,6 @@ static int opal_event_base_close(void)
  * Globals
  */
 opal_event_base_t *opal_sync_event_base=NULL;
-opal_event_base_t *opal_async_event_base=NULL;
 
 static int opal_event_base_open(mca_base_open_flag_t flags)
 {

opal/mca/event/external/external.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2011-2013 Cisco Systems, Inc.  All rights reserved.
+ * Copyright (c) 2011-2015 Cisco Systems, Inc.  All rights reserved.
  * Copyright (c) 2013      Los Alamos National Security, LLC.  All rights reserved.
  * Copyright (c) 2015      Intel, Inc. All rights reserved.
  *
@@ -29,7 +29,6 @@ typedef struct event_base opal_event_base_t;
 typedef struct event opal_event_t;
 
 OPAL_DECLSPEC extern opal_event_base_t *opal_sync_event_base;
-OPAL_DECLSPEC extern opal_event_base_t *opal_async_event_base;
 
 #define OPAL_EV_TIMEOUT EV_TIMEOUT
 #define OPAL_EV_READ    EV_READ

opal/mca/event/libevent2022/libevent2022.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2010      Cisco Systems, Inc.  All rights reserved.
+ * Copyright (c) 2010-2015 Cisco Systems, Inc.  All rights reserved.
  * Copyright (c) 2010      Oracle and/or its affiliates.  All rights reserved.
  * Copyright (c) 2012-2013 Los Alamos National Security, LLC.
  *                         All rights reserved.
@@ -68,7 +68,6 @@ typedef struct event_base opal_event_base_t;
 typedef struct event opal_event_t;
 
 OPAL_DECLSPEC extern opal_event_base_t *opal_sync_event_base;
-OPAL_DECLSPEC extern opal_event_base_t *opal_async_event_base;
 
 #define OPAL_EV_TIMEOUT EV_TIMEOUT
 #define OPAL_EV_READ    EV_READ