Export normalize method from writer service inside cassandra package
Export normalize method from writer service inside cassandra package

Signed-off-by: Bojan Blagojevic <eb4bc7de131d33de3b5f3c09e5c0f325fe2c5a30@gmail.com>

drasko/mainflux,Mainflux/mainflux-lite,drasko/mainflux,drasko/mainflux