mod_bosh: Set base_type on session
This fixes a traceback with mod_saslauth. Ideally we move this to util.session
at some point, though.
For full information on our dependencies, version requirements, and
where to find them, see https://prosody.im/doc/depends
If you have luarocks available on your platform, install the following:
- luaexpat
- luasocket
- luafilesystem
- luasec