Beanstream: Add additional Legato and vault support

I'm OK with removing it but I noticed that there are similar token query implementations for [CyberSource](https://github.com/Shopify/active_merchant/blob/master/lib/active_merchant/billing/gateways/cyber_source.rb#L182) and [eWay](https://github.com/Shopify/active_merchant/blob/master/lib/active_merchant/billing/gateways/eway_managed.rb#L97) already within active_merchant. In that case, shouldn't we remove those as well?