Force heartbeat period reset on mtcAgent process startup

In the case of a Multi Node Failure Avoidance (MNFA) event,
mtcAgent (Maintenance) sends a 'back-off' request to the
hbsAgent (Heartbeat) while there appears to be a networking
issue that affects a number of hosts.

This 'back-off' request tells the heartbeat service to slow
down by a factor of 4; what was say a 100 ms period would
change to a 400 ms period while in MNFA mode. When the MNFA
condition resolves the mtcAgent sends a heartbeat 'recovery'
command to the heartbeat service telling it to restore the
heartbeat interval back the configured interval.

However, if the mtcAgent process is 'restarted' while in
MNFA mode, the knowledge that the heartbeat service was
running at a reduced rate is lost and not restored.

This update forces the heartbeat rate to be set back to the
configured rate when the mtcAgent starts up.

Note that MNFA mode is not and should not be preserved over
mtcAgent process restart. If after restart a MNFA event.

Change-Id: I254ef86c453cb2d40cbeda859bd7477ac28942bc
Closes-Bug: 1884556
Signed-off-by: Eric MacDonald <eric.macdonald@windriver.com>

mtce/src/maintenance/mtcNodeCtrl.cpp

@@ -85,8 +85,6 @@ int mtc_service_inbox ( nodeLinkClass   *  obj_ptr,
                         mtc_socket_type * sock_ptr,
                         int              interface );
 
-string my_hostname = "" ;
-
 /** Instanciate the NodeLinkClass and pointer to it */
 nodeLinkClass       mtcInv ;
 nodeLinkClass *     mtcInv_ptr ;
@@ -1544,6 +1542,12 @@ void daemon_service_run ( void )
         mtcTimer_start ( mtcInv.mtcTimer_dor, mtcTimer_handler, timeout );
     }
 
+    /* If mtcAgent is starting up tell the heartbeat service to heartbeat
+     * at its configured rate.
+     * This is done in case the mtcAgent was restarted while in MNFA mode
+     * where it had commanded the hbsAgent to heartbeat at a reduced rate. */
+    send_hbs_command ( mtcInv.my_hostname, MTC_RECOVER_HBS );
+
     /* Run Maintenance service forever */
     for ( ; ; )
     {