Bug fix when handling the end separator of the customized log directory in LogBase

[zhaoyuguang]

resolve #1169

[codecov-io]

Codecov Report

Merging #1172 into master will decrease coverage by 0.01%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master    #1172      +/-   ##
============================================
- Coverage     42.87%   42.86%   -0.02%     
+ Complexity     1541     1539       -2     
============================================
  Files           330      330              
  Lines          9764     9764              
  Branches       1318     1318              
============================================
- Hits           4186     4185       -1     
  Misses         5064     5064              
- Partials        514      515       +1

Impacted Files	Coverage Δ	Complexity Δ
...ain/java/com/alibaba/csp/sentinel/log/LogBase.java	56.94% <100%> (ø)	10 <0> (ø)	⬇️
...ava/com/alibaba/csp/sentinel/node/ClusterNode.java	96.55% <0%> (-3.45%)	10% <0%> (-1%)
...m/alibaba/csp/sentinel/log/DateFileLogHandler.java	54.54% <0%> (-3.04%)	6% <0%> (-1%)
...a/csp/sentinel/slots/statistic/base/LeapArray.java	67.32% <0%> (-2.98%)	33% <0%> (-1%)
...p/sentinel/datasource/consul/ConsulDataSource.java	72.46% <0%> (+7.24%)	7% <0%> (ø)	⬇️

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[sczyh30]

Thanks!