dev#116562 : Adding adminvars for Pellicule

adding test for headers

FEATURES/116562

+        '116562' =>
+            ['Label' => $this->_('Fournisseur de vignettes'),
+             'Desc' => $this->_('Bokeh permet de spécifier les informations permettant l\'accès au service Electre REST API version 2'),
+             'Image' => '',
+             'Video' => '',
+             'Category' => $this->_('Enrichissements'),
+             'Right' => function($feature_description, $user) {return true;},
+             'Wiki' => 'http://wiki.bokeh-library-portal.org/index.php?title=Vignette#Fournisseur_de_vignettes',
+             'Test' => '',
+             'Date' => '2021-01-28'],
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