Fix/list metric files

[CarpenterLee]

Describe what this PR does / why we need it

MetricWriter#listMetricFiles() method is used for listing all metric files of the specific app. It uses String.contains() to search the metric file name instead of whole matching, this will lead wrong file reading when appName contains some other one, for example one appName is simple-Sentinel-SDK-Demo, the other is Sentinel-SDK-Demo, the former app's metric file will appearing in the latter metric files list.

MetricWriter#listMetricFiles() should return right metric files name list.

Does this pull request fix one issue?

Fixes #330

Describe how you did it

Use whole string matching instead of String.contains() to filter app metric file name.

Describe how to verify it

Run test cases.

Special notes for reviews

[codecov-io]

Codecov Report

Merging #331 into master will increase coverage by 0.08%.
The diff coverage is 38.09%.

@@             Coverage Diff              @@
##             master     #331      +/-   ##
============================================
+ Coverage     38.33%   38.42%   +0.08%     
- Complexity      934      937       +3     
============================================
  Files           218      218              
  Lines          6925     6935      +10     
  Branches        941      942       +1     
============================================
+ Hits           2655     2665      +10     
- Misses         3932     3933       +1     
+ Partials        338      337       -1

Impacted Files	Coverage Δ	Complexity Δ
...ibaba/csp/sentinel/node/metric/MetricSearcher.java	0% <0%> (ø)	0 <0> (ø)	⬇️
...libaba/csp/sentinel/node/metric/MetricsReader.java	0% <0%> (ø)	0 <0> (ø)	⬇️
...alibaba/csp/sentinel/node/metric/MetricWriter.java	58.57% <53.33%> (+1.78%)	21 <2> (+2)	⬆️
...s/block/flow/controller/RateLimiterController.java	91.66% <0%> (+12.5%)	6% <0%> (+1%)	⬆️

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[sczyh30]

LGTM