MB-100: AutoFailoverTests with sleep logging

Change-Id: I2d1e0b8dc2951b75610797f5a08866b1456c061f
Reviewed-on: http://review.couchbase.org/25172
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Andrei Baranouski <andrei.baranouski@gmail.com>