Add support to run trafgen in Kubernetes pods with pinned CPU

[amitpd]

I am trying to run trafgen from a Kubernetes pod with pinned CPU. The VM has 16 vCPUs and the pod is allocated only vCPUs 6-7,14-15

The trafgen.cfg file is configured to send packets to CPU 6 only.

cpu(6):
{
...
}

When I run below trafgen command, it fails with error message Can't set this cpu affinity!

trafgen --dev eth0 --conf trafgen.cfg --no-sock-mem -n 16

Output:

Can't set this cpu affinity!
Can't set this cpu affinity!
Can't set this cpu affinity!
Can't set this cpu affinity!
Can't set this cpu affinity!
Can't set this cpu affinity!
Can't set this cpu affinity!
Can't set this cpu affinity!
Can't set this cpu affinity!
Can't set this cpu affinity!
Can't set this cpu affinity!
Can't set this cpu affinity!

The message is printed exactly 12 times (16 - 4) for the CPUs not available to the pod.

Expected Result:

1. The trafgen should try to send packet only using CPU id defined in the trafgen.cfg
2. If CPU is not set in trafgen.cfg, trafgen should only use CPU allocated to the pod