SEOUL (Reuters) - Samsung Electronics , the world's top smartphone maker, said on Monday that it has named President Roh Tae-moon as its new mobile chief as part of a management shake-up. Roh, at 51, is the youngest president at Samsung, championed Samsung's strategic shift to outsource more phones to Chinese and other companies, to cut costs and to better compete with cheaper Chinese rivals like Huawei, people familiar with the matter previously told Reuters.As former mobile development head,..