Usability: Deletion of an app should not allow deletion of "shared" routes and services

[giner]

It seems to me (please tell me if I'm wrong) that there is no a good reason in allowing removing routes and services used by multiple applications as it provides an easy way to misoperate.

Expected behaviour

While deleting an app:

• show all routes mapped to the app but allow to select for deletion only those which are not mapped to any other apps
• show all services bound to the app but allow to select for deletion only those which are not bound to any other apps

Actual behaviour

• show all routes mapped to the app (including "shared") and allow to select any of them for deletion
• show all services bound to the app (including "shared") with a warning message (see It is easy to delete a service by accident when deleting an app #2727) for "shared" services and allow to select any of them for deletion

[richard-cox]

After chatting to @giner at Basel I agree that we should make these changes