Investigate sporadic failures in yast_users test module
What started as #108995 on aarch64 is now also seen on x86_64, so it cannot be blamed on "slow arch" any longer.
The test module issues a command
yast users add username=test_yast password=suse and this simple command sporadically times out.
Attempts to mitigate this problem by adding a real timeout value to the
script_run call did not help.
AC1: Investigate the root cause of those sporadic failures.
AC2: Find a way to mitigate this issue.