Test using period none for creating new BufferedWriters.
Test using period none for creating new BufferedWriters.

This fixes some deadlocks updating whoosh documents.

rockneurotiko/wirecloud,jpajuelo/wirecloud,jpajuelo/wirecloud,rockneurotiko/wirecloud,rockneurotiko/wirecloud,rockneurotiko/wirecloud,jpajuelo/wirecloud,jpajuelo/wirecloud