MB-10883: Dont need to pack meta and seqno

Change-Id: Id735dde9db6c0abda43e6e16a328649a07d51509
Reviewed-on: http://review.couchbase.org/36466
Tested-by: Bin Cui <bin.cui@gmail.com>
Reviewed-by: Bin Cui <bin.cui@gmail.com>