Remove test data that's unnecessary for the test
Extract need data into test helper
Reduce test data duplication for BrowsingNeedsTest
Simplify test data in CloseAsDuplicateTest
Wrap test data in ExportingNeedsTest
Simplify test data for FilteringNeedsTest
Simplify test data for ReopeningNeedsTest
Merge pull request #125 from alphagov/test-improvements

Test data improvements