Update mock version

Change-Id: Id5895473168d4fed367cd72faa4f5fad05ef1a6c
Reviewed-on: http://review.couchbase.org/41093
Reviewed-by: Sergey Avseyev <sergey.avseyev@gmail.com>
Tested-by: Sergey Avseyev <sergey.avseyev@gmail.com>