LONDON (Reuters) - British online grocer Ocado plans to open its first mini robotic warehouse, or customer fulfilment centre (CFC), in Bristol, western England, it said on Thursday.While Ocado's retail business holds only a 1.4% share of Britain's grocery market, its warehouse technology has powered the group's 8.1 billion pound ($10.4 billion) stock market valuation.The new facility, which is being built in an existing 150,000 square feet warehouse, will be Ocado's sixth CFC and is expected to..