MB-28230: Do not round up to the nearest second while snoozing a task
MB-28230: Do not round up to the nearest second while snoozing a task

There will be cases where tasks would have to sleep for a
sub-second time period. For example, in the ItemCompressorTask,
there is a need to wake up every few milliseconds in order
to compress items in the hash table.

Change-Id: If979b192540f004544c0e07c9c4aa0266f61dc9b
Reviewed-on: http://review.couchbase.org/91999
Tested-by: Build Bot <80754af91bfb6d1073585b046fe0a474ce868509@couchbase.com>
Reviewed-by: Dave Rigby <a09264da4832c7ff1d3bf1608a19f4b870f93750@couchbase.com>

daverigby/kv_engine,daverigby/kv_engine,daverigby/kv_engine,daverigby/kv_engine