Data sources must be private to user

[rochecompaan]

A user should only be able to see a list of their own data sources and should be limited to editing the data sources they created.

On the server-side, modify the permissions so that only the owner can add, edit, view, list and delete data sources.

On the front end, limit the data sources displayed and available for editing when clicking on the data sources icon.

Users that have access to a dashboard should still be able to use data sources indirectly through the queries that use them, but they should never have any direct access to data sources.

[nvernooy]

Data sources are bound to the user that added it. Admin users are able to see all data sources