Improvements to the federation test client

python_dependencies: Use bcrypt module instead of py-bcrypt

so that you don't necessarily need a config file.

Make it read the config file, primarily.

Add missing parameter to _base.start_worker_reactor

escape the % that got added in 92168cbb so that the process starts up ok.

Allow configuration of CPU affinity

Make it possible to set the CPU affinity in the config file, so that we don't
need to remember to do it manually every time.

We have 10 copies of this code, and I don't really want to update each one
separately.

Fix port script for user directory tables

Increase cache hit ratio for push

We don't update the cache in all code paths, which causes subsequent
calls to miss the cache

Add more metrics to push rule evaluation

Push: Don't acquire lock unless necessary

Use less DB for device list handling in sync

encode sync-response statically

Don't compute push actions for backfilled events

Add a frontend proxy

Perf: Don't filter events for push

We know the users are joined and we can explicitly check for if they are
ignoring the user, so lets do that.