update generation bash to handle vendor dir

hack/update-codegen.sh

@@ -45,7 +45,8 @@ GV_DIRS=()
 for gv in "${GROUP_VERSIONS[@]}"; do
 	# add items, but strip off any leading apis/ you find to match command expectations
 	api_dir=$(kube::util::group-version-to-pkg-path "${gv}")
-	pkg_dir=${api_dir#apis/}
+  nopkg_dir=${api_dir#pkg/}
+	pkg_dir=${nopkg_dir#apis/}
 
 	# skip groups that aren't being served, clients for these don't matter
     if [[ " ${KUBE_NONSERVER_GROUP_VERSIONS} " == *" ${gv} "* ]]; then