Expose the capability to config wred drop probability#571

Merged

lguohan merged 2 commits intosonic-net:masterfrom wendani:wred_drop_prob

Aug 16, 2018

+95-43

Commits on Aug 9, 2018

Add the capability to set wred drop probability of all packet colors
wendani
committed

Commits on Aug 10, 2018

Ensure drop probability takes default value 100% if not explicitly
wendani
committed