mod_limits: Use rate limiting in net.server if provided This should be simpler and more efficient, as well avoid problems caused by using filters.

server_epoll: Add native support for per socket bandwith limits

Merge 0.11->trunk

util.poll: Add missing return statements in fallback mode These allowed modifying or deleting select() state for unregistered FDs. During normal usage this should never happen. Modifying one that isn't set might cause weirdness but deleting an already deleted FD isn't a problem.

mod_admin_telnet: Use already generated session id Don't need to construct it from components again

mod_admin_telnet: Allow specifying a reason when closing sessions (#1400)

util.xmppstream: Inherit xml:lang from stream to stanzas (fixes #1401)

mod_websocket: Clone stanza before mutating (fixes #1398) Checking for `stanza.attr.xmlns == nil` to determine if the stanza object is an actual stanza (`<message>`, `<presence>` or `<iq>` in the `jabber:client` or `jabbber:server` namespace) or some other stream element. Since this mutation is not reverted, it may leak to other places and cause them to mistreat stanzas as stream elements. Especially in cases like MUC where a single stanza is broadcast to many recipients.

net.server_epoll: Remove unused local [luacheck]

mod_pubsub: Eliminate dead code `data` is a stanza and always truthy