all targets: use numerically prefixed uci-defaults file names to better control order of execution

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@35217 3c298f89-4303-0410-b956-a3cf2f4a3e73
base-files: use numerically prefixed uci-defaults names

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@35218 3c298f89-4303-0410-b956-a3cf2f4a3e73
ipv6-support: adapt UCI defaults to new ordering

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@35219 3c298f89-4303-0410-b956-a3cf2f4a3e73