Update stressng.md to reflect crd requirements

[MansM]

looking for "jobfile.j2" at "/opt/ansible/roles/stressng/templates/jobfile.j2"
File lookup using /opt/ansible/roles/stressng/templates/jobfile.j2 as file
fatal: [localhost]: FAILED! => {
    "msg": "The task includes an option with an undefined variable. The error was: 'dict object' has no attribute 'cpu_method'. 'dict object' has no attribute 'cpu_method'. 'dict object' has no attribute 'cpu_method'. 'dict object' has no attribute 'cpu_method'\n\nThe error appears to be in '/opt/ansible/roles/stressng/tasks/main.yaml': line 4, column 5, but may\nbe elsewhere in the file depending on the exact syntax problem.\n\nThe offending line appears to be:\n\n\n  - name: template stressng config file\n    ^ here\n"
}

Type of change

• [ ] Refactor
• [ ] New feature
• [ ] Bug fix
• [ ] Optimization
• [x] Documentation Update

Description

Related Tickets & Documents

• Related Issue #
• Closes #

Checklist before requesting a review

• [ ] I have performed a self-review of my code.
• [ ] If it is a core feature, I have added thorough tests.

Testing

• Please describe the System Under Test.
• Please provide detailed steps to perform tests related to this code change.
• How were the fix/results from this change verified? Please provide relevant screenshots or results.