feeds.conf.default: Change openwrt feeds urls from https to svn
SVN-Revision: 15077
-src-svn packages https://svn.openwrt.org/openwrt/branches/packages_8.09 https://svn.openwrt.org/openwrt/packages
+src-svn packages svn://svn.openwrt.org/openwrt/branches/packages_8.09 svn://svn.openwrt.org/openwrt/packages
src-svn xwrt http://x-wrt.googlecode.com/svn/tags/kamikaze_8.09/package
src-svn luci http://svn.luci.subsignal.org/luci/tags/0.8.6/contrib/package