China approves Shenzhen-Hong Kong stock connect scheme

* Second link unlikely to trigger demand for mainland stocks * Scheme seen positive in longer term * Southbound leg usage in Hong Kong Shanghai connect grows (Adds details, comments) SHANGHAI, August 16 (Reuters) - China's Premier Li Keqiang said the Cabinet had approved the launch of the Shenzhen-Hong Kong Stock Connect programme, putting in motion the final link of an ambitious plan to connect the gigantic stock markets of Hong Kong and the mainland. The actual launch of the scheme is unlikely