node | node api and default config fix

[ucwong]

No description provided.

[codecov]

Codecov Report

Merging #609 into master will increase coverage by 0.18%.
The diff coverage is 15.78%.

@@            Coverage Diff             @@
##           master     #609      +/-   ##
==========================================
+ Coverage   46.33%   46.52%   +0.18%     
==========================================
  Files         403      403              
  Lines       50863    50804      -59     
==========================================
+ Hits        23568    23637      +69     
+ Misses      25530    25383     -147     
- Partials     1765     1784      +19     

Impacted Files	Coverage Δ
node/api.go	4.00% <ø> (+1.61%)	⬆️
node/errors.go	37.50% <ø> (ø)
node/service.go	41.66% <0.00%> (-3.79%)	⬇️
node/defaults.go	23.07% <9.52%> (-8.75%)	⬇️
node/config.go	45.97% <20.58%> (-6.69%)	⬇️
trie/sync_bloom.go	60.52% <0.00%> (-5.27%)	⬇️
p2p/discover/lookup.go	95.23% <0.00%> (-1.91%)	⬇️
p2p/discv5/table.go	60.27% <0.00%> (-1.37%)	⬇️
trie/proof.go	75.37% <0.00%> (-1.12%)	⬇️
core/tx_pool.go	75.66% <0.00%> (-0.94%)	⬇️
... and 13 more

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