AVM: Don't parallelize tests that use shared for loop var

[jannotti]

Fix to run tests properly, no non-test changes.

[codecov]

Codecov Report

Merging #4253 (64bd903) into master (9e91460) will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #4253   +/-   ##
=======================================
  Coverage   55.10%   55.11%           
=======================================
  Files         395      395           
  Lines       50117    50117           
=======================================
+ Hits        27619    27624    +5     
+ Misses      20122    20116    -6     
- Partials     2376     2377    +1     

Impacted Files	Coverage Δ
catchup/peerSelector.go	98.95% <0.00%> (-1.05%)	⬇️
data/abi/abi_type.go	87.67% <0.00%> (-0.95%)	⬇️
cmd/tealdbg/debugger.go	72.69% <0.00%> (-0.81%)	⬇️
catchup/service.go	69.38% <0.00%> (+0.49%)	⬆️
network/wsPeer.go	67.94% <0.00%> (+2.46%)	⬆️

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[cce]

Good strong message, you tell'em