set networkID to chainID by default

[ucwong]

No description provided.

[codecov]

Codecov Report

Merging #1793 (971d81d) into master (6cf3989) will increase coverage by 0.03%.
Report is 362 commits behind head on master.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #1793      +/-   ##
==========================================
+ Coverage   52.69%   52.72%   +0.03%     
==========================================
  Files         485      485              
  Lines       60520    60523       +3     
==========================================
+ Hits        31890    31911      +21     
+ Misses      26183    26157      -26     
- Partials     2447     2455       +8     

Files	Coverage Δ
ctxc/config.go	40.00% <ø> (ø)
ctxc/backend.go	0.00% <0.00%> (ø)

... and 17 files with indirect coverage changes