Merge branch 'rename_sanitize_in_check_task' into 'master'

Rename sanitize in check task

This is to prevent the name clash between `sanitize_helper.rb` method sanitize and the method used to check if env variable is set in rake task.

See merge request !1336

lib/tasks/gitlab/check.rake

@@ -786,14 +786,14 @@ namespace :gitlab do
   end
 
   def sanitized_message(project)
-    if sanitize
+    if should_sanitize?
       "#{project.namespace_id.to_s.yellow}/#{project.id.to_s.yellow} ... "
     else
       "#{project.name_with_namespace.yellow} ... "
     end
   end
 
-  def sanitize
+  def should_sanitize?
     if ENV['SANITIZE'] == "true"
       true
     else