DVR: save the rewrite length in packet meta-data for features
DVR: save the rewrite length in packet meta-data for features

Change-Id: I0efd03bdb84bc9ff2334d398bfdb82486228114a
Signed-off-by: Neale Ranns <7d187a79c6b4bf1b7a865a4d130ff0038bf5d84b@cisco.com>

vpp-dev/vpp,FDio/vpp,chrisy/vpp,FDio/vpp,FDio/vpp,chrisy/vpp,vpp-dev/vpp,chrisy/vpp,vpp-dev/vpp,vpp-dev/vpp,vpp-dev/vpp,vpp-dev/vpp,chrisy/vpp,chrisy/vpp,chrisy/vpp,vpp-dev/vpp,FDio/vpp,chrisy/vpp,chrisy/vpp,FDio/vpp,FDio/vpp,FDio/vpp,FDio/vpp