* fixes async_handler_wrapper

adds missing runner variable from async to async_handler_wrapper
removes redundant have_async definition in wrap_async_run, defined at top of module

* only use async handler wrapper,
remove async_wrap_run

There are modules that will not work with prosody 0.10 as they depend on util.async. Adds a safeguard and print error about it in the logs.
And others that just do not work because of the muc module API that they use.

Adds some debug messages when token verification fails for some reason.

fixes handling of keyserver ASAP validation of tokens
wraps room and room-size APIs

Checks for a parameter named subdomain and if it exists, adds it to the roomname as used in multiple domain mode ([subdomain]roomname@conference.example.com).
Moves muc_size module to per-host module and adds token verification.

Adds and the default conference. part where the muc module live in default deployments.

This reverts commit e2e04e3f16.

Queries room for their size or room particiapnt's information. Depends on luarocks net-url module.