fix issue #81 - incorrect partition id in sst mode

[xiajingchun]

fix issue #81

[codecov-commenter]

Codecov Report

Merging #82 (2e2b763) into master (d6bc88c) will decrease coverage by 0.08%.
The diff coverage is 33.33%.

@@             Coverage Diff              @@
##             master      #82      +/-   ##
============================================
- Coverage     55.14%   55.05%   -0.09%     
  Complexity       76       76              
============================================
  Files            17       17              
  Lines          1342     1344       +2     
  Branches        254      255       +1     
============================================
  Hits            740      740              
- Misses          473      474       +1     
- Partials        129      130       +1     

Impacted Files	Coverage Δ
...com/vesoft/exchange/common/utils/NebulaUtils.scala	62.06% <33.33%> (-2.22%)	⬇️

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[Nicole00]

great！Thanks~