sonic-cli commands resulting error messages [/tmp/klish.fifo.62.TUKsQ0: 1: /tmp/klish.fifo.62.TUKsQ0: python: not found]

[vemulabalaji]

Description

Steps to reproduce the issue:

1. Load 202012 image on ACCTON board.
2. change to super user, using sudo command
3. Go to sonic-cli by executing sonic-cli.

Describe the results you received:
root@sonic:/# sonic-cli
sonic# show system cpu
/tmp/klish.fifo.62.8rCDDe: 1: /tmp/klish.fifo.62.8rCDDe: python: not found
sonic# show system memory
/tmp/klish.fifo.62.TUKsQ0: 1: /tmp/klish.fifo.62.TUKsQ0: python: not found
sonic# show system processes
/tmp/klish.fifo.62.EVERwb: 1: /tmp/klish.fifo.62.EVERwb: python: not found
sonic#
sonic# show platform syseeprom
/tmp/klish.fifo.62.Wc61oH: 1: /tmp/klish.fifo.62.Wc61oH: python: not found
sonic#

Describe the results you expected:
Proper system details to be displayed.

Additional information you deem important (e.g. issue happens only occasionally):
Observed always.
Output of show version:

```

root@sonic:/# show version

SONiC Software Version: SONiC.202012.0-dirty-20210121.151533
Distribution: Debian 10.7
Kernel: 4.19.0-9-2-amd64
Build commit: c40e43a
Build date: Thu Jan 21 14:37:37 UTC 2021
Built by: balaji@sfstypc01

Platform: x86_64-accton_as7716_32x-r0
HwSKU: Accton-AS7716-32X
ASIC: broadcom
ASIC Count: 1
Serial Number: 771632X1716006
Uptime: 15:11:58 up 3 days, 6:12, 1 user, load average: 1.10, 0.66, 0.67

Docker images:
REPOSITORY TAG IMAGE ID SIZE
docker-syncd-brcm 202012.0-dirty-20210121.151533 31da68bbc647 640MB
docker-syncd-brcm latest 31da68bbc647 640MB
docker-teamd 202012.0-dirty-20210121.151533 3b70ff11e03b 404MB
docker-teamd latest 3b70ff11e03b 404MB
docker-router-advertiser 202012.0-dirty-20210121.151533 da3a0568a09d 394MB
docker-router-advertiser latest da3a0568a09d 394MB
docker-platform-monitor 202012.0-dirty-20210121.151533 f3d6085b5aac 602MB
docker-platform-monitor latest f3d6085b5aac 602MB
docker-lldp 202012.0-dirty-20210121.151533 2e77354b69e3 434MB
docker-lldp latest 2e77354b69e3 434MB
docker-snmp 202012.0-dirty-20210121.151533 600b1390f5a4 434MB
docker-snmp latest 600b1390f5a4 434MB
docker-database 202012.0-dirty-20210121.151533 838418af03c5 394MB
docker-database latest 838418af03c5 394MB
docker-sonic-mgmt-framework 202012.0-dirty-20210121.151533 522f8bd8d879 610MB
docker-sonic-mgmt-framework latest 522f8bd8d879 610MB
docker-orchagent 202012.0-dirty-20210121.151533 a40bdb01250b 422MB
docker-orchagent latest a40bdb01250b 422MB
docker-nat 202012.0-dirty-20210121.151533 389bde0b5fb8 407MB
docker-nat latest 389bde0b5fb8 407MB
docker-dhcp-relay 202012.0-dirty-20210121.151533 4f334a65ad3f 401MB
docker-dhcp-relay latest 4f334a65ad3f 401MB
docker-sonic-telemetry 202012.0-dirty-20210121.151533 362cd36da3e6 468MB
docker-sonic-telemetry latest 362cd36da3e6 468MB
docker-fpm-frr 202012.0-dirty-20210121.151533 7e4bb8f1ea5e 421MB
docker-fpm-frr latest 7e4bb8f1ea5e 421MB
docker-sflow 202012.0-dirty-20210121.151533 2c01d3ffcab1 405MB
docker-sflow latest 2c01d3ffcab1 405MB

root@sonic:/#
```

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

```
root@sonic:/# generate_dump

/usr/local/bin/generate_dump: line 89: syntax error near unexpected token fi' /usr/local/bin/generate_dump: line 89: fi'
root@sonic:/#
```

[vemulabalaji]

Please let me know any other logs/details are required.

[ben-gale]

Per @kwangsuk, this is a Python 3 thing. This PR fixes it - [(https://github.com/sonic-net/sonic-mgmt-framework/pull/76)] - however [https://github.com//pull/6148] is also needed, and this still hasn't merged.