[api] Fire exit event in start_trace
[api] Fire exit event in start_trace

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