[connect timers]: Check if timer was active

Before cancelling it :)

Change-Id: I2ba119b7e32cddc5255b52ae4d012ea223ea3b13
Reviewed-on: http://review.couchbase.org/28282
Tested-by: Mark Nunberg <mnunberg@haskalah.org>
Reviewed-by: Sergey Avseyev <sergey.avseyev@gmail.com>