The "stream" request-map in ecommerce and commonext controllers requires authentication

For security reason, the "stream" request-map

1. in ecommerce controller have been temporarily commented out.
2. in commonext controller has been changed to require authentication.

We will need to

1. put back the functionnalities allowed by the "stream" request-map in ecommerce .
2. later check that mandatory authentication in commonext controller no impact.

Eventually it turned out that we simply needed to require authentication in both cases (back and front ends). Because in ecommerce/ecomseo webapps the stream request is only used to post images in blog entries an you need to be logged in to do so.