Use device dns server first in chroot

https://github.com/offensive-security/kali-nethunter/issues/123
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Script will check dns servers 1-4 from getprop then populate resolv.conf.  As a backup it will add opendns entries by default.

Signed-off-by: binkybear <binkybear@nethunter.com>
Add unset LD_PRELOAD to all scripts

For lollipop

Signed-off-by: binkybear <binkybear@nethunter.com>
Remove bacon from nethunterbuilder.sh lollipop

Signed-off-by: binkybear <binkybear@nethunter.com>