Let's try to rationalise the logging that happens when we are processing an
incoming transaction, to make it easier to figure out what is going wrong when
they take ages. In particular:

- make everything start with a [room_id event_id] prefix
- make sure we log a warning when catching exceptions rather than just turning
  them into other, more cryptic, exceptions.

Update to use new timeout function everywhere.

The existing deferred timeout helper function (and the one into twisted)
suffer from a bug when a deferred's canceller throws an exception, #3842.

The new helper function doesn't suffer from this problem.

Fix matrixfederationclient.py logging: Destination is a string

Set SNI to the server_name, not whatever was in the SRV record

Bump timeout on get_missing_events request

When we do a join, always try the server we used for the alias lookup first.

Fixes #2418

We want to wait until we have read the response body before we log the request
as complete, otherwise a confusing thing happens where the request appears to
have completed, but we later fail it.

To do this, we factor the salient details of a request out to a separate
object, which can then keep track of the txn_id, so that it can be logged.

Add python_version phone home stat

Fixes #3843

don't ratelimit autojoins

Add variable for changing the max upload size in Docker container

Return a 404 when deleting unknown room alias

Fix more b'abcd' noise in metrics

Fix typo in README, synaspse -> synapse

Signed-off-by: Aaron Raimist <aaron@raim.ist>

Signed-off-by: Aaron Raimist <aaron@raim.ist>

Fix some b'abcd' noise in logs and metrics