Add task to scan old champs pj

lib/tasks/2018_06_04_scan_pjs.rake

@@ -0,0 +1,7 @@
+namespace :'2018_06_04_scan_pjs' do
+  task scan_all: :environment do
+    Champs::PieceJustificativeChamp.all.each do |pj_champ|
+      pj_champ.create_virus_scan
+    end
+  end
+end