* docs for tokenserver process_account_events
* add docs for spanner purge ttl
* add kubernetes workload references and status
* cargo update, update validator to 0.19, audit ignore due to diesel limitation
This is a breaking change. This commit separates syncstorage and tokenserver settings into separate structs that are contained by a parent `Settings` struct. This means that any env vars that hold settings specific to syncstorage (e.g. `SYNC_DATABASE_URL`) have been renamed to `SYNC_SYNCSTORAGE__DATABASE_URL`. Any settings that were moved from the top-level `Settings` struct to the lower level, syncstorage-specific struct will now have a `SYNC_SYNCSTORAGE__` prefix instead of a `SYNC_` prefix.
Closes#1276
* Also made "no_auth" a feature flag function
* included dependencies for golang, protobuf and libgrpcdev into setup
docs.
* may revisit some tools to make testing and debugging stuff like this
easier.
Closes#320
