noosfero | Fix access to plugin administration pages (#417)

[Victor Costa]

New comment for Merge Request 417

https://gitlab.com/noosfero/noosfero/merge_requests/417#note_759517


Victor Costa

Some classes aren't related to plugin settings (e.g. DisplayContentPluginAdminController, ContainerBlockPluginAdminController) so I didn't touch them.

I also changed only the plugins that the tests are ok (to ensure that I'll not introduce a wrong behavior).



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