investigate: "replace the KMD usage in pingpong with direct signing"

[tsachiherman]

Reverts #2689

[codecov-commenter]

Codecov Report

Merging #2690 (fa95695) into master (39be0c7) will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2690      +/-   ##
==========================================
+ Coverage   47.07%   47.08%   +0.01%     
==========================================
  Files         349      349              
  Lines       55858    55858              
==========================================
+ Hits        26294    26301       +7     
+ Misses      26617    26611       -6     
+ Partials     2947     2946       -1     

Impacted Files	Coverage Δ
ledger/blockqueue.go	82.18% <0.00%> (-2.88%)	⬇️
data/transactions/verify/txn.go	48.45% <0.00%> (ø)
ledger/acctupdates.go	62.38% <0.00%> (+0.08%)	⬆️
catchup/service.go	69.35% <0.00%> (+0.77%)	⬆️
network/wsPeer.go	75.20% <0.00%> (+0.83%)	⬆️
cmd/tealdbg/debugger.go	73.86% <0.00%> (+1.00%)	⬆️
ledger/roundlru.go	96.22% <0.00%> (+5.66%)	⬆️

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