fix exporter append

Mod: Remove unnecessary return and judgement.

Fix: fix init config problem in HystrixFilter

Ftr: bitmap in router chain

Rft: Change file name to the same as interface name

Doc: modify changes.md

Rft: avoid initint the log twice 

fix: When using service discovery and provider is registered, consumer can't refresh directory

Fix: Register service instance after provider config load

call subscribe function asynchronously

Fix: fix tag router rule copy