Merge branch '2192_remove_approvals_value' into 'master'

Remove records with action=approvals from system_note_metadata

Closes #2192

See merge request !1673

db/migrate/20170419065104_notes_metadata_remove_approvals_value.rb

+class NotesMetadataRemoveApprovalsValue < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  def up
+    execute("DELETE FROM system_note_metadata WHERE action = 'approvals'")
+  end
+end

db/schema.rb

@@ -11,7 +11,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20170408033905) do
+ActiveRecord::Schema.define(version: 20170419065104) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"