drop cc and bcc from messages

these have not been used ever

test plan
 - migrations should run

Change-Id: I44df2abe7df87ff4b3789ec55d8a6a553139155f
Reviewed-on: https://gerrit.instructure.com/48814
Tested-by: Jenkins
Reviewed-by: Cody Cutrer <cody@instructure.com>
Product-Review: Rob Orton <rob@instructure.com>
QA-Review: Rob Orton <rob@instructure.com>

app/models/mailer.rb

@@ -1,5 +1,5 @@
 #
-# Copyright (C) 2011 Instructure, Inc.
+# Copyright (C) 2011 - 2015 Instructure, Inc.
 #
 # This file is part of Canvas.
 #
@@ -33,8 +33,6 @@ class Mailer < ActionMailer::Base
 
     reply_to = reply_to_mailbox(m)
     params[:reply_to] = reply_to if reply_to
-    params[:cc] = m.cc if m.cc
-    params[:bcc] = m.bcc if m.bcc
 
     mail(params) do |format|
       format.text{ render text: m.body }

config/initializers/dropped_columns.rb

@@ -42,6 +42,7 @@ class ActiveRecord::Base
     'failed_jobs' => %w(original_id),
     'grading_periods' => %w(course_id account_id),
     'groups' => %w(sis_name type groupable_id groupable_type),
+    'messages' => %w(cc bcc),
     'notification_policies' => %w(user_id broadcast),
     'page_views' => %w(contributed),
     'pseudonyms' => %w(sis_update_data deleted_unique_id sis_source_id crypted_webdav_access_code type),

db/migrate/20150213200336_drop_cc_bcc_from_messages.rb

@@ -0,0 +1,13 @@
+class DropCcBccFromMessages < ActiveRecord::Migration
+  tag :postdeploy
+
+  def up
+    remove_column :messages, :cc
+    remove_column :messages, :bcc
+  end
+
+  def down
+    add_column :messages, :cc, :string
+    add_column :messages, :bcc, :string
+  end
+end