rpc image - No module named ptf

[mykolaf]

Description

Faced issue while running CoPP test:

root@sonic:/# /usr/bin/python /opt/ptf_nn_agent.py --device-socket 1@tcp://0.0.0.0:10900 -i 1-3@Ethernet12 --set-nn-rcv-buffer=109430400 --set-iface-rcv-buffer=109430400 --set-nn-snd-buffer=109430400 --set-iface-snd-buffer=109430400
Traceback (most recent call last):
  File "/opt/ptf_nn_agent.py", line 38, in <module>
    from ptf import afpacket
ImportError: No module named ptf

Looks like ptf_nn_agent.py has new dependency. Due to it being downloaded by wget we uncontrollably received an updated version.

Steps to reproduce the issue:

1. run CoPP test

Describe the results you received:

Traceback from nn agent.
Describe the results you expected:

Functioning ptf_nn_agent
Additional information you deem important (e.g. issue happens only occasionally):

**Output of `show version`:**

SONiC Software Version: SONiC.HEAD.31-505d4bfb
Distribution: Debian 9.12
Kernel: 4.9.0-11-2-amd64
Build commit: 505d4bfb
Build date: Mon Mar 16 04:52:34 UTC 2020
Built by: johnar@jenkins-worker-8

**Attach debug file `sudo generate_dump`:**

```
(paste your output here)
```

[nazariig]

Closed by #4279