ubuntu_kvm_unit_tests complains about find_word: command not found on s390x

[Po-Hsu Lin]

This issue happens after kvm-unit-test repo updated to d8a4f9e5 (ci: Update the list of tests that we run in the Fedora Cirrus-CI),

In scripts/s390x/func.bash it use find_word:

  # run PV test case
  if [ "$ACCEL" = 'tcg' ] || find_word "migration" "$groups"; then
      return
  fi

But it's not defined in the same .bash file, therefore it will complain about:
  scripts/s390x/func.bash: line 24: find_word: command not found
   Written tests/intercept.

[Po-Hsu Lin (cypressyew)]

Fixed in:
https://gitlab.com/kvm-unit-tests/kvm-unit-tests/-/commit/a245e92b23d16ef07b07fd0ade1a4184cfd76b03