add new package for a local opkg mirror

opkg_mirror/files/opkg.conf

+dest root /
+dest ram /tmp
+lists_dir ext /var/opkg-lists
+option overlay_root /overlay
+src/gz barrier_breaker_base http://[fe80::380f:97ff:fea9:5aa8%br-client]/dev/openwrt.draic.info/barrier_breaker/14.07/ar71xx/generic/packages/base
+src/gz barrier_breaker_luci http://[fe80::380f:97ff:fea9:5aa8%br-client]/dev/openwrt.draic.info/barrier_breaker/14.07/ar71xx/generic/packages/luci
+src/gz barrier_breaker_packages http://[fe80::380f:97ff:fea9:5aa8%br-client]/dev/openwrt.draic.info/barrier_breaker/14.07/ar71xx/generic/packages/packages
+src/gz barrier_breaker_routing http://[fe80::380f:97ff:fea9:5aa8%br-client]/dev/openwrt.draic.info/barrier_breaker/14.07/ar71xx/generic/packages/routing
+src/gz barrier_breaker_telephony http://[fe80::380f:97ff:fea9:5aa8%br-client]/dev/openwrt.draic.info/barrier_breaker/14.07/ar71xx/generic/packages/telephony
+src/gz barrier_breaker_management http://[fe80::380f:97ff:fea9:5aa8%br-client]/dev/openwrt.draic.info/barrier_breaker/14.07/ar71xx/generic/packages/management
+src/gz barrier_breaker_oldpackages http://[fe80::380f:97ff:fea9:5aa8%br-client]/dev/openwrt.draic.info/barrier_breaker/14.07/ar71xx/generic/packages/oldpackages
+