Hide device displaynames from other users anoa/msc3480

Some argument finagling was needed as query_local_devices can be called
from requests of both local and remote users, and in the case of remote
users, without a user ID.

In the end, we have an option 'from_local_user_id' which tells
`query_local_devices` both a) whether the request is from a local or
remote user and b) if a local user, which one.

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