[test-failover]: make dummy timer for iocp

We can't just run the event loop as the IOCP plugin will complain about
a timeout not being set. Let's make a dummy lcb_timer_t so it won't
complain

Change-Id: Ic624c1c48552a537f1c0cef9d8663f62f737de1b
Reviewed-on: http://review.couchbase.org/28289
Tested-by: Mark Nunberg <mnunberg@haskalah.org>
Reviewed-by: Sergey Avseyev <sergey.avseyev@gmail.com>