Only listen on the given interfaces.

Stop being a public dns forwarder on our external interfaces.

bug:7530468
Change-Id: Ic94cd66e66371de4fcc54f53b9f267f6611804b8
Add liblog

Bug: 8580410
Change-Id: I0e478ef39bfdc83adaa8cbbd9c1b5a6b0d28bb39
Merge https://android.googlesource.com/platform/external/dnsmasq into jb-devel