Develop generic code fix

fix(core): add lock for attachment

change the position of the lock

support sticky connection

feat(registry/zk):url encode zkpath

Ftr: add async call for dubbo protocol

fix travis-ci problem

change lock position

change lock position

fix: zkRegistry.Destroy() -- negative Waitgroup counter

consistent hash load balance

Signed-off-by: imxyb <xyb4638@gmail.com>

Ftr: Replace func(int, int) with TpsLimitStrategyCreator interface

fix(common): use new uuid method

Add: Split config center GetConfig method

feat(dubbo/invoker): 修改dubbo 关闭的方式