Deploy on BTP (#793)

minimal changes required to deploy the CAP samples in _shared db_ mode:
- db: all bookshop, orders, reviews CDS models into one db instance (_shared-db_)
- services: bookstore, orders, reviews
- approuter with UI symlinks:
  - Vue: bookshop, reviews
  - Fiori: orders
 - authentification: xsuaa
 - messaging: Event Mesh
 - destinations: orders, reviews
- cds:
  - projection OrdersNoDraft for backend direct access
  - event OrderChanged
- deployment: mta.yml

bookstore/srv/mashup.js

@@ -29,7 +29,7 @@ module.exports = async()=>{ // called by server.js
   CatalogService.on ('OrderedBook', async (msg) => {
     const { book, quantity, buyer } = msg.data
     const { title, price } = await db.read (Books, book, b => { b.title, b.price })
-    return OrdersService.create ('Orders').entries({
+    return OrdersService.create ('OrdersNoDraft').entries({
       OrderNo: 'Order at '+ (new Date).toLocaleString(),
       Items: [{ product:{ID:`${book}`}, title, price, quantity }],
       buyer, createdBy: buyer