qos_sai test failing due to error "command() got an unexpected keyword argument 'argv'

[neethajohn]

Description
Prior to b38562a, 'SonicAsic' class method 'command' signature was
def command(self, *args, **kwargs):

Now it uses a new format:
def command(self, cmdstr):

Steps to reproduce the issue:

1. Run test_qos_sai.py

Describe the results you received:

 >           result = dut_asic.command(argv = ["arp", "-n"])
 E           TypeError: command() got an unexpected keyword argument 'argv'

Describe the results you expected:
Test should run without any errors

Additional information you deem important:

**Output of `show version`:**

201911 image