add peerid cache

[codecov-commenter]

Codecov Report

Merging #450 (d7b0307) into master (3df1568) will increase coverage by 0.01%. The diff coverage is 21.42%.

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@@            Coverage Diff             @@
##           master     #450      +/-   ##
==========================================
+ Coverage   43.80%   43.82%   +0.01%     
==========================================
  Files         149      149              
  Lines       13358    13366       +8     
==========================================
+ Hits         5852     5857       +5     
- Misses       6321     6325       +4     
+ Partials     1185     1184       -1     

Files	Coverage Δ
bcs/network/p2pv2/server.go	48.74% <21.42%> (-1.52%)	:arrow_down:

... and 2 files with indirect coverage changes

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