removed memcached from vw install in build
removed memcached from vw install in build

SeldonIO/seldon-server,smrjan/seldon-server,SeldonIO/seldon-server,smrjan/seldon-server,SeldonIO/seldon-server,smrjan/seldon-server,SeldonIO/seldon-server,smrjan/seldon-server,smrjan/seldon-server,SeldonIO/seldon-server