* resolve_conffiles: Existing conffile /etc/config/dhcp is different from the conffile in the new package. The new conffile will be placed at /etc/config/dhcp-opkg.
這個提示是正常的，是配置文件沖突，保留了原來的配置而已,dnsmasq ful報的
安裝與卸載應該同步進行opkg remove dnsmasq && opkg install dnsmasq-full