* 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.
这个提示是正常的，是配置文件冲突，保留了原来的配置而已,dnsmasq ful报的
安装与卸载应该同步进行opkg remove dnsmasq && opkg install dnsmasq-full