CBQE-1068 Fix observe test hang

- no need to do stale=ok query after delete. It can lead to non-deterministic results.
- add timeout to view queries.
- correct the expected_rows passed to viewquery after delete.

Change-Id: If4b39b0321ae5cb08ca3205b1c4953261381c8b3
Reviewed-on: http://review.couchbase.org/24917
Reviewed-by: Andrei Baranouski <andrei.baranouski@gmail.com>
Tested-by: Deepkaran Salooja <deepkaran.salooja@globallogic.com>