removed self-hosted options and cleaned code related to it (bug 616242):
cleaned self_hosted for buttons
removed self-hosted options and cleaned code related to it
removed Addon.models.is_selfhosted
removed 'self_hosted' related mentions
removed STATUS_LISTED completely
removed selfhosted references from frontend

fixed robhudsun feedback
Merge pull request #1225 from vinyll/remove_status_listed-616242-COMPILED

removed self-hosted options and cleaned code related to it: