Remove m.login.token from advertised flows.

Use min and not max to set an upper bound on retry interval

s/private_user_data/account_data/

Take a boolean not a list of lambdas

Split out text for missing config options.

Fix database port script to work with new event_search table

Share sytest clone across runs

Depends on https://github.com/matrix-org/synapse/pull/380

Depends on https://github.com/matrix-org/synapse/pull/380

This allows packages to more easily override the default messages to
include package specific options.

Only retry federation requests for a long time for background requests