treewide: change ubus socket path
OpenWrt developers in upcoming version of OpenWrt 21.02 and newer decided that the will run ubusd as non-root user and because of that, they moved it from /var/run/ubus.sock to /var/run/ubus/ubus.sock
Reference:
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OpenWrt developers in upcoming version of OpenWrt 21.02 and newer decided that the will run ubusd as non-root user and because of that, they moved it from /var/run/ubus.sock to /var/run/ubus/ubus.sock
Reference: