[show] [lldp] Fix error 'the input device is not a TTY' when running 'show lldp table/neighbor'#1067

bingwang-ms merged 1 commit intosonic-net:201911sonic-net/sonic-utilities:201911from

bingwang-ms:fix_show_lldpbingwang-ms/sonic-utilities:fix_show_lldpCopy head branch name to clipboard