MB-100: read conf for larger value size

Change-Id: I10355b0b9014d7fa5d43b273e139c28a5056f862
Reviewed-on: http://review.couchbase.org/27731
Reviewed-by: Ronnie Sun <ronnie@couchbase.com>
Tested-by: Ronnie Sun <ronnie@couchbase.com>
MB-100: revised read dgm testcas

Change-Id: I688072d9748c85bb96061bc3d58cdffc87835739
Reviewed-on: http://review.couchbase.org/27738
Reviewed-by: Ronnie Sun <ronnie@couchbase.com>
Tested-by: Ronnie Sun <ronnie@couchbase.com>