DUBAI, June 10 (Reuters) - Qatar&aposs central bank plans to issue 4 billion riyals ($1.1 billion) worth of local currency government bonds next week, it said on Tuesday, including a new seven-year tranche to build a longer yield curve.The debt, to be auctioned on Sunday, will include 2.1 billion riyals worth of three-year conventional bonds and 950 million riyals each of five- and seven-year tran