Add kube-ui cluster addon for serving k8s dashboard UI.

Changes include:
- Add kube-ui binary for serving static dashboard UI
- Add kube-ui docker image, replication controller, and service
- Make the kube-ui a cluster-addon (enabled by default)
- Split the compiled pkg/ui/datafile.go into separate dashboard and swagger packages
- Update docs to reflect changes

hack/build-ui.sh

@@ -30,16 +30,39 @@ if ! which go-bindata > /dev/null 2>&1 ; then
 	exit 1
 fi
 
-DATAFILE=pkg/ui/datafile.go
-TMP_DATAFILE=/tmp/datafile.go
+readonly TMP_DATAFILE="/tmp/datafile.go"
+readonly DASHBOARD_SRC="www/app/..."
+readonly DASHBOARD_PKG="dashboard"
+readonly SWAGGER_SRC="third_party/swagger-ui/..."
+readonly SWAGGER_PKG="swagger"
 
-go-bindata -nocompress -o $DATAFILE -prefix ${PWD} -pkg ui www/app/... third_party/swagger-ui/...
+function kube::hack::build_ui() {
+  local pkg="$1"
+  local src="$2"
+  local output_file="pkg/ui/data/${pkg}/datafile.go"
 
-cat hooks/boilerplate.go.txt > $TMP_DATAFILE
-echo "// generated by hack/build-ui.sh; DO NOT EDIT
-" >> $TMP_DATAFILE
-cat $DATAFILE >> $TMP_DATAFILE
+  go-bindata -nocompress -o "${output_file}" -prefix ${PWD} -pkg "${pkg}" "${src}"
 
-gofmt -s -w $TMP_DATAFILE
+  local year=$(date +%Y)
+  cat hooks/boilerplate.go.txt | sed "s/YEAR/${year}/" > "${TMP_DATAFILE}"
+  echo -e "// generated by hack/build-ui.sh; DO NOT EDIT\n" >> "${TMP_DATAFILE}"
+  cat "${output_file}" >> "${TMP_DATAFILE}"
 
-mv $TMP_DATAFILE $DATAFILE
+  gofmt -s -w "${TMP_DATAFILE}"
+
+  mv "${TMP_DATAFILE}" "${output_file}"
+
+}
+
+case "${1:-}" in
+  dashboard)
+    kube::hack::build_ui "${DASHBOARD_PKG}" "${DASHBOARD_SRC}"
+    ;;
+  swagger)
+    kube::hack::build_ui "${SWAGGER_PKG}" "${SWAGGER_SRC}"
+    ;;
+  *)
+    kube::hack::build_ui "${DASHBOARD_PKG}" "${DASHBOARD_SRC}"
+    kube::hack::build_ui "${SWAGGER_PKG}" "${SWAGGER_SRC}"
+    ;;
+esac