MB-7483: Use ep_max_size not ep_max_data_size

We are deprecating ep_max_data_size

Change-Id: I9d1f7998e88ae3d247707ad3eda8686e8d3dd531
Reviewed-on: http://review.couchbase.org/26947
Reviewed-by: Michael Wiederhold <mike@couchbase.com>
Tested-by: Michael Wiederhold <mike@couchbase.com>