Port receipt and read markers to async/wait

Port replication http server endpoints to async/await

Port room rest handlers to async/await

Port federation_server to async/await

Merge branch 'erikj/federation_server_async_await' of github.com:matrix-org/synapse into erikj/receipts_async_await

* Don't use a virtualenv

* Generate the server's signing key to allow it to start

* Add signing key paths to CI configuration files

* Use a Python script to create the postgresql database

* Improve logging

another typo

fix typo

Quick fix to ensure cache descriptors always return deferreds

Make room directory search case insensitive