#901 Optimize the memory usage.

[cvictory]

What this PR does:

Optimize some memory usage issue , please refer to #901
In this way, we can remove some lock for it is cloned in MergeURL

Which issue(s) this PR fixes:

Fixes #901

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

[codecov-io]

Codecov Report

Merging #902 (0ff136d) into develop (fb86fc9) will decrease coverage by 0.01%.
The diff coverage is 75.00%.

@@             Coverage Diff             @@
##           develop     #902      +/-   ##
===========================================
- Coverage    59.88%   59.86%   -0.02%     
===========================================
  Files          260      260              
  Lines        12849    12854       +5     
===========================================
+ Hits          7694     7695       +1     
- Misses        4195     4198       +3     
- Partials       960      961       +1     

Impacted Files	Coverage Δ
common/url.go	57.59% <75.00%> (+1.00%)	⬆️
remoting/kubernetes/listener.go	50.52% <0.00%> (-3.16%)	⬇️
cluster/cluster_impl/failback_cluster_invoker.go	75.90% <0.00%> (-2.41%)	⬇️

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