noosfero | Remove redundant load of plugins' rake tasks (#750)

[Rodrigo Souto]

Merge Request #750 was closed by Rodrigo Souto
Merge Request url: https://gitlab.com/noosfero/noosfero/merge_requests/750
Project:Branches: arthurmde/noosfero:fix_plugin_tasks_load to noosfero/noosfero:master
Author: Arthur Del Esposte
Assignee: 
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