workflow v0.9.9

Improvements

• Optimize Dns Cache's searching speed and memory size
• Optimize route manager and dns resolver
• Increase server task's performance by reducing some atomic operations
• Increase global performance by removing some singletons
• Always use dns resolver as name service policy when redirecting
• Add WFServer::get_listen_addr() for server started on a random port
• Support kafka kip 329

Bug Fixes

• Fix service governance's ref count bug
• Fix mysql sequence id bug when retrying big request
• Fix VNSWRR upstream bug
• Fix dns client bug when host name has trailing dot
• Fix URL parser fatal bug