Wait for async finish and skip async test on Ruby 1.8
Wait for async finish and skip async test on Ruby 1.8

boyang-li/oboe-ruby,boyang-li/oboe-ruby,boyang-li/oboe-ruby,tlunter/oboe-ruby,appneta/ruby-traceview,appneta/ruby-traceview,tlunter/oboe-ruby,appneta/ruby-traceview,tlunter/oboe-ruby,appneta/ruby-traceview,boyang-li/oboe-ruby,tlunter/oboe-ruby