Commit offsets before subscribing to fix start time functionality
Created by: matthew-d-jones
Description of work
Start time functionality is broken by an immediate partition rebalance after subscribe is called, which resets the offsets. The fix is to commit the offsets before calling subscribe.
Issue
Closes #239 (closed)
Acceptance Criteria
Test using data from NeXus-Streamer.
Unit Tests
N/A, change is in Kafka interface.
Code Review (To be filled in by the reviewer only)
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