Add --disable-redirect-output to configure script

This patch makes it possible to control the default redirection of
(misbehaving) services output to /dev/null.  With this disabled,
a service may write to its stdout/stderr and mess up the console.

By default all service/run/tasks stdout/stderr is redirected.

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>

src/service.c

@@ -258,7 +258,9 @@ static int service_start(svc_t *svc)
 				dup2(fd, STDERR_FILENO);
 				close(fd);
 			}
-		} else {
+		}
+#ifdef REDIRECT_OUTPUT
+		else {
 			FILE *fp;
 
 			fp = fopen("/dev/null", "w");
@@ -268,6 +270,7 @@ static int service_start(svc_t *svc)
 				fclose(fp);
 			}
 		}
+#endif
 
 	logger_err:
 		sig_unblock();