Fix wd_authkey bug in that a request to add new node to the clusetr is rejected by...

Fix wd_authkey bug in that a request to add new node to the clusetr is rejected by master

This is a bug is due to the following commit.

commit 39de4a11d48b0ca50a4e8a9538265441994298b8
Author: Muhammad Usama <m.usama@gmail.com>
Date:   Thu Mar 30 02:00:49 2017 +0500

    Enhancing the handling of split-brain scenario by the watchdog.

This changed the definition of tv_sec that is used to check wd_authkey so
that this was affected by the clock of OS. So, if there is a lag between
two nodes' clocks, the wd_authkey check fails.