Updates fail because statically configured DNS fail to resolve cdn.sipeed.com

[UmbraAtrox]

By default Nanokvm ignores DHCP dns and uses static dns from /boot/resolv.conf instead

/etc/init.d/S02config - overwrites resolv.conf every boot

	if [ -e /boot/resolv.conf ]
	then
		rm -rf /etc/resolv.conf
		cp -vf /boot/resolv.conf /etc/resolv.conf
	fi

/usr/share/udhcpc/default.script - writes to seemingly unused ? resolv.conf.dhcp

if [ -e /boot/resolv.conf ]
then
        RESOLV_CONF="/etc/resolv.conf.dhcp"
fi

resulting /etc/resolv.conf from /boot/resolv.conf

nameserver 192.168.0.1
nameserver 8.8.4.4
nameserver 8.8.8.8
nameserver 114.114.114.114
nameserver 119.29.29.29
nameserver 223.5.5.5

but none of the dns servers can resolve cdn.sipeed.com which hosts the updates.

# nslookup cdn.sipeed.com 8.8.8.8
Server:         8.8.8.8
Address:        8.8.8.8:53

** server can't find cdn.sipeed.com: SERVFAIL

*** Can't find cdn.sipeed.com: No answer

# nslookup cdn.sipeed.com 8.8.4.4
;; connection timed out; no servers could be reached

# nslookup cdn.sipeed.com 114.114.114.114
Server:         114.114.114.114
Address:        114.114.114.114:53

** server can't find cdn.sipeed.com: SERVFAIL

*** Can't find cdn.sipeed.com: No answer

# nslookup cdn.sipeed.com 119.29.29.29
;; connection timed out; no servers could be reached

# nslookup cdn.sipeed.com 223.5.5.5
Server:         223.5.5.5
Address:        223.5.5.5:53

** server can't find cdn.sipeed.com: SERVFAIL

*** Can't find cdn.sipeed.com: No answer

#783
mv|rm /boot/resolv.conf doesn't fix it because udhcpc/default.script appends comments to nameservers which cause

# nslookup cdn.sipeed.com
nslookup: bad address '10.0.1.1 # eth0'

related issues:
#583
#569
#399
#311
#245
#277