Do no wait on restart unless required

Angel process waits some time before restarting the child process if crashed.
The wait time is only required if the child process is restarting too often.
This patch drastically improve re-start time.

src/main.cpp

@@ -769,11 +769,15 @@ int main(int argc, const char * argv[]) {
 	if (glovars.proxy_restart_on_error) {
 gotofork:
 		if (laststart) {
-			//daemon_log(LOG_INFO, "Angel process is waiting %d seconds before starting a new ProxySQL process\n", glovars.proxy_restart_delay);
-			parent_open_error_log();
-			proxy_info("Angel process is waiting %d seconds before starting a new ProxySQL process\n", glovars.proxy_restart_delay);
-			parent_close_error_log();
-			sleep(glovars.proxy_restart_delay);
+			int currenttime=time(NULL);
+			if (currenttime == laststart) { /// we do not want to restart multiple times in the same second
+				// if restart is too frequent, something really bad is going on
+				//daemon_log(LOG_INFO, "Angel process is waiting %d seconds before starting a new ProxySQL process\n", glovars.proxy_restart_delay);
+				parent_open_error_log();
+				proxy_info("Angel process is waiting %d seconds before starting a new ProxySQL process\n", glovars.proxy_restart_delay);
+				parent_close_error_log();
+				sleep(glovars.proxy_restart_delay);
+			}
 		}
 		laststart=time(NULL);
 		pid = fork();