[sonic-clear] add a clear fdb command#186

Merged

lguohan merged 4 commits intosonic-net:masterfrom keboliu:clear-fdb-cli

Jan 26, 2018

+89

Commits on Jan 12, 2018

Commits on Jan 16, 2018

remove redundant comments
keboliu
committed

Commits on Jan 24, 2018

publish the fdb flush msg via APPL_DB instead of ASIC_DB
keboliu
committed