CBQE-2464: fix cbqe to throw EOF errors to main thread during rev_id_verification

Change-Id: I5e01838e3d1db3c778c5a8ca5ec9e8c4f1f58d3b
Reviewed-on: http://review.couchbase.org/42921
Reviewed-by: Sangharsh Agarwal <sangharsh.agarwal@globallogic.com>
Tested-by: Sangharsh Agarwal <sangharsh.agarwal@globallogic.com>