manually merge the work made by pull request #1491 on master branch

[beiwei30]

What is the purpose of the change

Update pom for into apache incubator, partial fix for this issue: https://issues.apache.org/jira/projects/DUBBO/issues/DUBBO-7?filter=allopenissues

Brief changelog

1. update pom.xml license
2. update scm, mailLists, issueManagement, organization
3. add DISCLAIMER

Verifying this change

All unit tests are pass

Follow this checklist to help us incorporate your contribution quickly and easily:

• Make sure there is a GITHUB_issue filed for the change (usually before you start working on it). Trivial changes like typos do not require a GITHUB issue. Your pull request should address just this issue, without pulling in other changes - one PR resolves one issue.
• Format the pull request title like [Dubbo-XXX] Fix UnknownException when host config not exist. Each commit in the pull request should have a meaningful subject line and body.
• Write a pull request description that is detailed enough to understand what the pull request does, how, and why.
• Write necessary unit-test to verify your logic correction, more mock a little better when cross module dependency exist. If the new feature or significant change is committed, please remember to add integration-test in test module.
• Run mvn clean install -DskipITs to make sure unit-test pass. Run mvn clean test-compile failsafe:integration-test to make sure integration-test pass.
• If this contribution is large, please file an Apache Individual Contributor License Agreement.

[diecui1202]

That's good to me. Please accept it.

@beiwei30 @chickenlj @ralf0131

[codecov-io]

Codecov Report

Merging #1554 into master will increase coverage by 0.91%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1554      +/-   ##
==========================================
+ Coverage   30.69%   31.61%   +0.91%     
==========================================
  Files         682      682              
  Lines       32174    33048     +874     
  Branches     6294     6597     +303     
==========================================
+ Hits         9877    10447     +570     
- Misses      20591    20742     +151     
- Partials     1706     1859     +153

Impacted Files	Coverage Δ
...ava/com/alibaba/dubbo/rpc/filter/tps/StatItem.java	79.16% <0%> (-15.84%)	⬇️
...o/rpc/cluster/support/MergeableClusterInvoker.java	37.86% <0%> (-7.92%)	⬇️
.../alibaba/dubbo/rpc/cluster/merger/ArrayMerger.java	61.9% <0%> (-6.52%)	⬇️
...alibaba/dubbo/remoting/transport/CodecSupport.java	69.23% <0%> (-4.69%)	⬇️
.../java/com/alibaba/dubbo/config/ConsumerConfig.java	53.84% <0%> (-4.49%)	⬇️
...n/java/com/alibaba/dubbo/rpc/support/RpcUtils.java	20.27% <0%> (-4.32%)	⬇️
.../rpc/cluster/router/condition/ConditionRouter.java	71.11% <0%> (-3.89%)	⬇️
...bbo/rpc/cluster/loadbalance/RandomLoadBalance.java	50% <0%> (-2.95%)	⬇️
...ba/dubbo/remoting/transport/netty/NettyClient.java	72.58% <0%> (-2.86%)	⬇️
...ba/com/caucho/hessian/io/CollectionSerializer.java	57.14% <0%> (-2.86%)	⬇️
... and 184 more

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