HTTP: Stop accepting requests on final system shutdown.

There are three CLI commands to stop and restart Asterisk each.

1) core stop/restart now - Hangup all calls and stop or restart Asterisk.
New channels are prevented while the shutdown request is pending.

2) core stop/restart gracefully - Stop or restart Asterisk when there are
no calls remaining in the system.  New channels are prevented while the
shutdown request is pending.

3) core stop/restart when convenient - Stop or restart Asterisk when there
are no calls in the system.  New calls are not prevented while the
shutdown request is pending.

ARI has made stopping/restarting Asterisk more problematic.  While a
shutdown request is pending it is desirable to continue to process ARI
HTTP requests for current calls.  To handle the current calls while a
shutdown request is pending, a new committed to shutdown phase is needed
so ARI applications can deal with the calls until the system is fully
committed to shutdown.

* Added a new shutdown committed phase so ARI applications can deal with
calls until the final committed to shutdown phase is reached.

* Made refuse new HTTP requests when the system has reached the final
system shutdown phase.  Starting anything while the system is actively
releasing resources and unloading modules is not a good thing.

* Split the bridging framework shutdown to not cleanup the global bridging
containers when shutting down in a hurry.  This is similar to how other
modules prevent crashes on rapid system shutdown.

* Moved ast_begin_shutdown(), ast_cancel_shutdown(), and
ast_shutting_down().  You should not have to include channel.h just to
access these system functions.

ASTERISK-24752 #close
Reported by: Matthew Jordan

Review: https://reviewboard.asterisk.org/r/4399/
........

Merged revisions 431692 from http://svn.asterisk.org/svn/asterisk/branches/13


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@431694 65c4cc65-6c06-0410-ace0-fbb531ad65f3

include/asterisk.h

@@ -111,6 +111,42 @@ int ast_register_cleanup(void (*func)(void));
  */
 void ast_unregister_atexit(void (*func)(void));
 
+/*!
+ * \brief Cancel an existing shutdown and return to normal operation.
+ *
+ * \note Shutdown can be cancelled while the server is waiting for
+ * any existing channels to be destroyed before shutdown becomes
+ * irreversible.
+ *
+ * \return non-zero if shutdown cancelled.
+ */
+int ast_cancel_shutdown(void);
+
+/*!
+ * \details
+ * The server is preventing new channel creation in preparation for
+ * shutdown and may actively be releasing resources.  The shutdown
+ * process may be canceled by ast_cancel_shutdown() if it is not too
+ * late.
+ *
+ * \note The preparation to shutdown phase can be quite lengthy
+ * if we are gracefully shutting down.  How long existing calls will
+ * last is not up to us.
+ *
+ * \return non-zero if the server is preparing to or actively shutting down.
+ */
+int ast_shutting_down(void);
+
+/*!
+ * \return non-zero if the server is actively shutting down.
+ * \since 13.3.0
+ *
+ * \details
+ * The server is releasing resources and unloading modules.
+ * It won't be long now.
+ */
+int ast_shutdown_final(void);
+
 #if !defined(LOW_MEMORY)
 /*!
  * \brief Register the version of a source code file with the core.