Sync apache dubbo code#1

Merged

kexianjun merged 12 commits intokexianjun:masterfrom apache:master

Aug 31, 2018

+1,969-130

Commits on Aug 21, 2018

HashedWheelTimer (#1973 )

carryxyh
authored and
beiwei30
committed

Commits on Aug 22, 2018

supplemental change for pull request 1973 (#2329 )
beiwei30
authored
[Dubbo- support tag router feature] Add a new Router implement -- TagRouter (#2228 )

lexburner
authored and
beiwei30
committed

Commits on Aug 23, 2018

Commits on Aug 28, 2018

Commits on Aug 31, 2018

Merge pull request #2360 , add xml configuration for graceful shutdown on ApplicationConfig level.

jinzeyu0
authored and
chickenlj
committed
Merge pull request #2378 , add unit test for HeaderExchanngeChannel.

Li Han
authored and
chickenlj
committed