[Delivers #183216235] Changes in trafgen for testing on container workloads

Amit Prasadrequested to merge
183216235-amit into touchstone-master-v0.6.8
  1. Allow running trafgen in pods with pinned cpu and specified cpu ids.
  2. Allow multiple cpus when running trafgen with rate limit.
  3. Allow sending traffic using pcap as input until interrupt received.
Edited by Amit Prasad

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