Add support for show/clear watermark for queue type ALL

[tonytitus]

What I did Added support for show/clear watermark for queue type ALL Why I did it

How I verified it

show queue watermark all | grep Ethernet116

Ethernet116 0 0 0 0 0 0 0 672

sonic-clear queue watermark all

show queue watermark all | grep Ethernet116

Ethernet116 0 0 0 0 0 0 0 0

Details if related

[neethajohn]

Please add unit tests. Refer tests/test_watermark.py