[pfcstat]: create python cli tool to show pfc counters #233
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This is t create new python tool to show pfc counters.
The following are usage page and sample output:
huima@huima-vm2:/datadrive/sonic-utilities/scripts$ ./pfcstat -h
usage: pfcstat [-h] [-v] [-c] [-d]
Display the pfc counters
optional arguments:
-h, --help show this help message and exit
-v, --version show program's version number and exit
-c, --clear Clear previous stats and save new ones
-d, --delete Delete saved stats
Examples:
pfcstat
pfcstat -c
pfcstat -d