Use C-style for loop for iterating testorder to react to length changes

[Vogtinator]

Fixes https://progress.opensuse.org/issues/69432

[okurz]

Applied the change manually on openqaworker5.suse.de with

curl -s https://raw.githubusercontent.com/Vogtinator/os-autoinst/master/autotest.pm >  /usr/lib/os-autoinst/autotest.pm

and triggered a test with

$ openqa-clone-job --within-instance https://openqa.suse.de --skip-chained-deps 4500252 WORKER_CLASS=openqaworker5 TEST=okurz_poo69432_ltp_input _GROUP=0 BUILD=X

sle-12-SP4-Server-DVD-Incidents-Kernel-x86_64-Build:15909:kernel-ec2-ltp_input@64bit -> https://openqa.suse.de/t4501133 PASSED

[codecov]

Codecov Report

Merging #1492 into master will decrease coverage by 0.05%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1492      +/-   ##
==========================================
- Coverage   56.18%   56.13%   -0.06%     
==========================================
  Files          54       54              
  Lines        6356     6362       +6     
==========================================
  Hits         3571     3571              
- Misses       2785     2791       +6     

Impacted Files	Coverage Δ
opt/autotest.pm	43.33% <0.00%> (-1.28%)	⬇️

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