Add binder calls to manage networks, interfaces, and UID ranges.

This allows us to remove some code from the DNS test.

Bug: 30944031
Test: netd_integration_test passes
Test: netd_unit_test shows no new failures
Test: system boots, networking works
Change-Id: Ic55761a360cdccf6c4843f42716e20bcc467d25a
7 files changed