support reading config file from hdfs

[Nicole00]

close #84

[codecov-commenter]

Codecov Report

Base: 55.67% // Head: 55.46% // Decreases project coverage by -0.20% ⚠️

Coverage data is based on head (bbdb414) compared to base (b86efc5).
Patch coverage: 20.00% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #106      +/-   ##
============================================
- Coverage     55.67%   55.46%   -0.21%     
  Complexity       81       81              
============================================
  Files            17       17              
  Lines          1419     1426       +7     
  Branches        267      268       +1     
============================================
+ Hits            790      791       +1     
- Misses          489      494       +5     
- Partials        140      141       +1     

Impacted Files	Coverage Δ
...la/com/vesoft/exchange/common/config/Configs.scala	61.55% <20.00%> (-0.58%)	⬇️

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