plugins: return table with empty rows array insteaf of nil

tests: Add TeamPicker test and update TeamPicker/UserPicker snapshots so they match the latest classNames update #10676

If the selected folder is not in the options then manually create it. This
can happen in some edge cases (if an user has been given access to a
dashboard but does not have access to its parent folder)

Editors should be able to create dashboards in root and should be
able to create folders. They cannot administrate permissions though
and these dashboards and folders will get the default permissions.

Allow users to change permissions inherited from root.

According to the author, the Ansible role is obsolete:
https://github.com/picotrading/ansible-grafana/issues/8#issuecomment-342210822
As the proposed alternative (https://github.com/jtyr/ansible-grafana/) hasn't been updated in the last two years either, I'm suggesting it should be removed altogether in favor of the role maintained by cloudalchemy.

* fix: repeat panels when row is expanding

* repeat panel: change test name to more clear one

Closes #10254

Without this fix then the querystring looks like ?abool=true which causes
a mismatch with the angular routing. This results in a redirect and messes
up the browser history and back button.