Hong Kong stock market to get $2 bln boost with Orient Sec, CDB Leasing share sales

* Orient Sec, CDB Leasing deals lined up this week * Both secure big backing from 'cornerstone' investors (Recasts to add CDB Leasing deal, cornerstone investors) HONG KONG, June 20 (Reuters) - Hong Kong's stock market isset for a $2 billion boost this week as major mainland Chinafinancial firms list units in the city, relying on large-scalebacking from domestic institutions to offset investors jittersover political concerns in Europe and the potential for a U.S.interest rate hike. ...