Needed before `pip instal --upgrade setuptools` for CentOS 7 and also doesn't hurt for any other distro.

Also added Fedora 25 to header as the same packages work for it as well.

Bump cache sizes for common membership queries

Measure new device list stuff

Make /keys/changes a bit more performant

Make presence.get_new_events a bit faster

We do this by caching the set of users a user shares rooms with.

Fix email push in pusher worker

This was broken when device list updates were implemented, as Mailer
could no longer instantiate an AuthHandler due to a dependency on
federation sending.

Include newly joined users in /keys/changes API