Disable rocksdb wal for statemachine on raft mode

[Linary]

Change-Id: I59c9b174a57aaf3859067459dd3195960e6d8d3c

[codecov]

Codecov Report

Merging #1318 (3f5f469) into master (0f15c46) will decrease coverage by 0.00%.
The diff coverage is 25.00%.

@@             Coverage Diff              @@
##             master    #1318      +/-   ##
============================================
- Coverage     62.33%   62.33%   -0.01%     
  Complexity     5772     5772              
============================================
  Files           377      377              
  Lines         31502    31504       +2     
  Branches       4412     4413       +1     
============================================
- Hits          19638    19637       -1     
- Misses         9871     9873       +2     
- Partials       1993     1994       +1     

Impacted Files	Coverage Δ	Complexity Δ
...raph/backend/store/rocksdb/RocksDBStdSessions.java	63.00% <25.00%> (-0.44%)	33.00 <0.00> (ø)

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