For non-overlay configuration we need checksum for config file that
weren't modified by the user. For OPKG in sysupgrade we check the status
file for the Conffiles: entry of every package. this entry contains
checksum for every static file that the package contains.
Provide the same info for APK by creating a conffiles_static file and
parse this file on sysupgrade for non-overlay configurations.
This is also used by the sysupgrade -u option to exclude non-changed
files from the final backup.
Link: https://github.com/openwrt/openwrt/pull/15543
Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
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