enhance shutdown hook in spring

[beiwei30]

What is the purpose of the change

enhance shutdown hook in spring, make sure shutdown hook always work in spring, no matter spring framework registers shutdown hook or not.

Brief changelog

XXXXX

Verifying this change

XXXXX

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

• Make sure there is a GITHUB_issue field 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 #XXX. 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 -DskipTests=false & mvn clean test-compile failsafe:integration-test to make sure unit-test and integration-test pass.
• If this contribution is large, please follow the Software Donation Guide.

[zonghaishang]

It looks good.

[codecov-io]

Codecov Report

Merging #3008 into master will decrease coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #3008      +/-   ##
==========================================
- Coverage   64.29%   64.28%   -0.02%     
==========================================
  Files         584      584              
  Lines       26055    26056       +1     
  Branches     4561     4562       +1     
==========================================
- Hits        16753    16749       -4     
+ Misses       7124     7123       -1     
- Partials     2178     2184       +6

Impacted Files	Coverage Δ
...ava/org/apache/dubbo/config/DubboShutdownHook.java	81.25% <ø> (+5.49%)	⬆️
...onfig/spring/extension/SpringExtensionFactory.java	85.36% <100%> (+0.75%)	⬆️
...ache/dubbo/remoting/transport/AbstractChannel.java	75% <0%> (-12.5%)	⬇️
...ache/dubbo/remoting/p2p/support/AbstractGroup.java	45.45% <0%> (-11.37%)	⬇️
...che/dubbo/remoting/transport/mina/MinaChannel.java	43.42% <0%> (-10.53%)	⬇️
...ng/exchange/support/header/HeartbeatTimerTask.java	73.68% <0%> (-5.27%)	⬇️
.../apache/dubbo/remoting/transport/AbstractPeer.java	58.69% <0%> (-4.35%)	⬇️
...he/dubbo/remoting/transport/netty/NettyServer.java	67.85% <0%> (-3.58%)	⬇️
...c/main/java/org/apache/dubbo/rpc/RpcException.java	85.71% <0%> (-3.58%)	⬇️
...rpc/protocol/dubbo/telnet/InvokeTelnetHandler.java	70.17% <0%> (-1.76%)	⬇️
... and 7 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update e4acdf7...81d73be. Read the comment docs.