runtime: log pid lifecycle at info level

src/libthecore/main.cpp

@@ -18,12 +18,12 @@ static int pid_init(void)
 	{
 		fprintf(fp, "%d", getpid());
 		fclose(fp);
-		sys_err("\nStart of pid: %d\n", getpid());
+		sys_log(0, "Start of pid: %d", getpid());
 	}
 	else
 	{
 		printf("pid_init(): could not open file for writing. (filename: ./pid)");
-		sys_err("\nError writing pid file\n");
+		sys_err("Error writing pid file");
 		return false;
 	}
 	return true;
@@ -36,7 +36,7 @@ static void pid_deinit(void)
     return;
 #else
     remove("./pid");
-	sys_err("\nEnd of pid\n");
+	sys_log(0, "End of pid");
 #endif
 }