tests: stop network before reading logs

[algorandskiy]

Summary

Test random failures debugging: retrieve logs after stopping the network to ensure all messages were flushed.

[codecov]

Codecov Report

Merging #4429 (38472f3) into master (bf7aaec) will increase coverage by 0.05%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4429      +/-   ##
==========================================
+ Coverage   55.18%   55.24%   +0.05%     
==========================================
  Files         398      398              
  Lines       50137    50137              
==========================================
+ Hits        27669    27697      +28     
+ Misses      20156    20136      -20     
+ Partials     2312     2304       -8     

Impacted Files	Coverage Δ
ledger/roundlru.go	90.56% <0.00%> (-5.67%)	⬇️
data/transactions/verify/txn.go	43.85% <0.00%> (-0.88%)	⬇️
ledger/acctupdates.go	69.29% <0.00%> (-0.60%)	⬇️
catchup/service.go	68.88% <0.00%> (-0.50%)	⬇️
network/wsNetwork.go	64.63% <0.00%> (ø)
crypto/merkletrie/node.go	93.48% <0.00%> (+1.86%)	⬆️
crypto/merkletrie/trie.go	68.61% <0.00%> (+2.18%)	⬆️
ledger/blockqueue.go	88.50% <0.00%> (+2.87%)	⬆️
agreement/cryptoVerifier.go	72.53% <0.00%> (+4.92%)	⬆️
network/wsPeer.go	70.95% <0.00%> (+5.47%)	⬆️

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