Remove unnecessary resolve_events_with_state_map

matrix-synapse-auto-deploy is no longer maintained. 

fix bug where preserved threepid user comes to sign up and server is …

Make sure that we close db connections opened during init

fix #3445 - do not use itervalues() on SortedDict()

itervalues(d) calls d.itervalues() [PY2] and d.values() [PY3]
but SortedDict only implements d.values()

don't return non-LL-member state in incremental sync state blocks

This gives clearer messages when someone gets it wrong

We should explicitly close any db connections we open, because failing to do so
can block other transactions as per
https://github.com/matrix-org/synapse/issues/3682.

Let's also try to factor out some of the boilerplate by having server classes
define their datastore class rather than duplicating the whole of `setup`.

Change admin_uri to admin_contact in config and errors

Fix checking if service notice room is already tagged

This manifested in synapse repeatedly setting the tag for the room

Fix up tagging server notice rooms.

Allow federation_domain_whitelist to be emtpy list

Outbound federation were incorrectly allowed when the config option was
set to an empty list