Write projection streams using the system principal instead of the current user #889
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Fixes #873
The UI part of this is EventStore/EventStore.UI#122
Queries were failing for non-admin users because they do not have access to write to system streams (including projection streams).
This fix uses the system principal to write to the projection streams instead of the current user. This only applies to once-off projections and queries, and happens after we ensure that the user has access to the stream he's trying to query.