Fix log context when sending requests

Fix notifier leak

Improve room init sync speed.

Sanitize logging

Make upload dir a configurable path.

Fixes SYN-425.

Signed-off-by: Eric Myhre <hash@exultant.us>

Refactor the notifier.wait_for_events code to be clearer. Add _NotifierUserStream.new_listener that accpets a token to avoid races.

Bug introduced in 92b20713
which reversed the comparison when checking if a user existed
in the users table. Added UTs to prevent this happening again.

Change listener config.

Hotfixes v0.9.2-r2