uci: copy permisions of /etc/config/ files for temp files

uci: copy permisions of /etc/config/ files for temp files

Hi

Using uci as a non root user i can get network configuration but not network state (for exemple).
The idea of this patch is to copy permission from config file, or if it doesn't exist use UCI_FILEMODE / UCI_DIRMODE

Tested on tplink wr1043nd. (you have to remove some mkdir from /etc/init.d/boot to fully see this patch work)
If you apply this patch (or a modified version), please also backport to AA

Signed-off-by: Etienne CHAMPETIER <etienne.champetier@free.fr>
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