[Dubbo-fix]: polish LFUCache

[tangcent]

What is the purpose of the change

review #5734

Brief changelog

• Rename constants to represent what it means:
  DEFAULT_LOAD_FACTOR -> DEFAULT_CAPACITY
  DEFAULT_EVICTION_CAPACITY -> DEFAULT_EVICTION_FACTOR
• Refactor codes:

if (map.containsKey(key)) {
         node = map.get(key);
         if (node != null) {
               CacheNode.withdrawNode(node);
         }
         node.value = value;
         freqTable[0].addLastNode(node);
         map.put(key, node);
 }

• Add test case org.apache.dubbo.common.utils.LRUCacheTest#testErrorConstructArguments.

Verifying this change

Run test case org.apache.dubbo.common.utils.LRUCacheTest

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 sample in dubbo samples project.
• 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.

[codecov-io]

Codecov Report

Merging #5994 (0f0905c) into master (279699f) will decrease coverage by 0.01%.
The diff coverage is 40.00%.

@@             Coverage Diff              @@
##             master    #5994      +/-   ##
============================================
- Coverage     58.65%   58.64%   -0.02%     
  Complexity      424      424              
============================================
  Files          1043     1043              
  Lines         42473    42472       -1     
  Branches       6212     6211       -1     
============================================
- Hits          24912    24907       -5     
- Misses        14773    14779       +6     
+ Partials       2788     2786       -2     

Impacted Files	Coverage Δ	Complexity Δ
...n/java/org/apache/dubbo/common/utils/LFUCache.java	84.31% <40.00%> (+4.70%)	0.00 <0.00> (ø)
.../remoting/transport/netty4/NettyClientHandler.java	67.79% <0.00%> (-16.95%)	0.00% <0.00%> (ø%)
...in/java/org/apache/dubbo/common/utils/JVMUtil.java	81.13% <0.00%> (-11.33%)	0.00% <0.00%> (ø%)
.../apache/dubbo/remoting/transport/AbstractPeer.java	58.69% <0.00%> (-4.35%)	0.00% <0.00%> (ø%)
.../dubbo/remoting/transport/netty4/NettyChannel.java	63.36% <0.00%> (-1.00%)	0.00% <0.00%> (ø%)
...e/dubbo/remoting/exchange/codec/ExchangeCodec.java	74.56% <0.00%> (-0.88%)	0.00% <0.00%> (ø%)
.../apache/dubbo/config/bootstrap/DubboBootstrap.java	42.01% <0.00%> (+0.31%)	0.00% <0.00%> (ø%)
...e/dubbo/remoting/transport/netty4/NettyServer.java	73.52% <0.00%> (+2.94%)	0.00% <0.00%> (ø%)
...c/main/java/org/apache/dubbo/rpc/RpcException.java	83.33% <0.00%> (+3.33%)	0.00% <0.00%> (ø%)
...ava/org/apache/dubbo/config/DubboShutdownHook.java	74.46% <0.00%> (+10.63%)	0.00% <0.00%> (ø%)
... and 1 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 279699f...0f0905c. Read the comment docs.

[superleo-cn]

LGTM. Approved.

[tangcent]

@chickenlj
PTAL, Fell free to close it if it has be included in other PRs or It is not expected to change. Thanks.

[AlbumenJ]

@tangcent hi, thanks for your contribution

pls resolve confilcts with the latest master branch

[tangcent]

@AlbumenJ done.