Don't manage iptables if we're in a choot

In chroots, as with diskimage-builder, managing service starts is
tricky. Also, we don't need to restart the service then, because
the service will get started on boot of the image.

Change-Id: Iaf90005039b8196ba3a0ac05c96d71e034f0b0b1
Merge "Don't manage iptables if we're in a choot"