[RHOCP 4] ovnkube-trace fails with unable to find pip3 library

Issue

• ovnkube-trace fails with pip3 not available in ovnkube-node container

  I0721 00:12:55.395494   22627 ovnkube-trace.go:1182] Skipped ovn-detrace due to: "dependencies check failed: \"ovn-detrace error in pod ovnkube-node-xxxx, container ovnkube-node. Error 'command terminated with exit code 127', stdOut: ''\\n stdErr: bash: line 1: pip3: command not found\\n\""
  
  

• ovnkube-trace fails while running the ovn-detrace