[Dubbo-7375]fix url add repeatedly

[kevinw66]

What is the purpose of the change

For-#7375

[brucelwl]

优化parameters hashCode计算方式

For-#7375

private int parametersHashCode() {
        int h = 0;
        for (Map.Entry<String, String> next : parameters.entrySet()) {
            if (Constants.TIMESTAMP_KEY.equals(next.getKey())) {
                continue;
            }
            h += next.hashCode();
        }
        return h;
    }

[codecov-io]

Codecov Report

Merging #7376 (2659217) into master (d009d0c) will decrease coverage by 0.08%.
The diff coverage is 88.88%.

@@             Coverage Diff              @@
##             master    #7376      +/-   ##
============================================
- Coverage     58.72%   58.64%   -0.09%     
+ Complexity      425      422       -3     
============================================
  Files          1043     1043              
  Lines         42471    42512      +41     
  Branches       6212     6225      +13     
============================================
- Hits          24942    24932      -10     
- Misses        14748    14791      +43     
- Partials       2781     2789       +8     

Impacted Files	Coverage Δ	Complexity Δ
...mon/src/main/java/org/apache/dubbo/common/URL.java	50.43% <88.88%> (+0.37%)	0.00 <0.00> (ø)
.../java/org/apache/dubbo/qos/command/impl/Ready.java	3.33% <0.00%> (-46.67%)	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/rpc/protocol/AsyncToSyncInvoker.java	62.06% <0.00%> (-10.35%)	0.00% <0.00%> (ø%)
.../registry/multicast/MulticastServiceDiscovery.java	50.00% <0.00%> (-10.00%)	0.00% <0.00%> (ø%)
.../dubbo/remoting/transport/netty4/NettyChannel.java	63.36% <0.00%> (-3.97%)	0.00% <0.00%> (ø%)
...e/dubbo/registry/integration/RegistryProtocol.java	58.49% <0.00%> (-2.84%)	0.00% <0.00%> (ø%)
...dubbo/remoting/exchange/support/DefaultFuture.java	85.47% <0.00%> (-2.57%)	0.00% <0.00%> (ø%)
...ubbo/registry/client/ServiceDiscoveryRegistry.java	48.21% <0.00%> (-2.39%)	0.00% <0.00%> (ø%)
...he/dubbo/common/threadpool/ThreadlessExecutor.java	94.23% <0.00%> (-1.93%)	0.00% <0.00%> (ø%)
... and 24 more

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