use setrlimit set rocksdb max open files

[nkysg]

only for unix system

[codecov]

Codecov Report

Merging #3148 (e4e0cd9) into master (a3e7973) will decrease coverage by 1.00%.
The diff coverage is 6.44%.

@@            Coverage Diff             @@
##           master    #3148      +/-   ##
==========================================
- Coverage   33.06%   32.07%   -0.99%     
==========================================
  Files         518      503      -15     
  Lines       46774    46256     -518     
  Branches    21278    21167     -111     
==========================================
- Hits        15461    14831     -630     
- Misses      16928    17477     +549     
+ Partials    14385    13948     -437     

Flag	Coverage Δ
unittests	32.07% <6.44%> (-0.99%)	⬇️

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Impacted Files	Coverage Δ
block-relayer/src/block_relayer.rs	15.79% <0.00%> (ø)
config/src/storage_config.rs	52.39% <ø> (ø)
executor/src/account.rs	14.29% <ø> (-29.82%)	⬇️
network/api/src/messages.rs	29.38% <ø> (ø)
node/src/node.rs	9.70% <0.00%> (-0.12%)	⬇️
rpc/api/src/types.rs	14.26% <0.00%> (+0.57%)	⬆️
state/api/src/chain_state.rs	46.80% <ø> (ø)
test-helper/src/executor.rs	25.22% <ø> (ø)
types/src/lib.rs	100.00% <ø> (ø)
vm/compiler/src/bytecode_transpose.rs	0.00% <0.00%> (ø)
... and 108 more

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