Improvements to privileged container verifier

[glenn-operant]

┌──────────────────────────────┬────────────────────────────────┬─────────┬────────────────────┬────────────────────┬─────────────────┐
│Experiment                    │Description                     │Framework│Tactic              │Technique           │Result           │
├──────────────────────────────┼────────────────────────────────┼─────────┼────────────────────┼────────────────────┼─────────────────┤
│cncf-demo-privileged-container│Run a privileged container in...│MITRE    │Privilege Escalation│Privileged Container│Deployed: success│
│                              │                                │         │                    │                    │Command: fail    │
│                              │                                │         │                    │                    │                 │
└──────────────────────────────┴────────────────────────────────┴─────────┴────────────────────┴────────────────────┴─────────────────┘

Adds params for the verifier to run a command and check for a non-zero error code, and also checks if it's managed to deploy a privileged container