udhcpc/default.script appends interface comment causing dns lookup to fail

By default dhcp dns servers get written by /usr/share/udhcpc/default.script to /etc/resolv.conf.dhcp which seems to get ignored, removing /boot/resolv.conf makes dhcp dns to be appended to /etc/resolv.conf as "nameserver 10.0.1.1 # eth0"  which then causes:

```

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

```

