The OpenWrt feeds.conf.defaults contains some feeds that are commented out
and not active. Such feeds will be returned by the default_feeds.sh script
anyway and causing pseudo feeds. Limit the script to only return active
feeds, by filtering out lines starting with '#'.
This usually only applies to the OpenWrt master branch.

Signed-off-by: Sven Roederer <freifunk@it-solutions.geroedel.de>

change as per NeoRider

modules.sh can't depend on openwrt/feeds.conf.default, otherwise the
initial update will fail.