Add first OWNERS files for core networking

Covering
  core/java/android/net/
  core/java/com/android/server/net/
  packages/CaptivePortalLogin/
  services/core/java/com/android/server/
    ConnectivityService.java
    NsdServic.java
    NetworkManagementService.java
  services/core/java/com/android/server/connectivity/
  services/net/
  tests/net/

Android core networking files not covered:
  services/core/jni/com_android_server_connectivity_tethering_OffloadHardwareInterface.cpp
  services/core/proto/ipconnectivity.proto (path unique to aosp)

Bug: 63408147
Test: builds
Change-Id: Ifbb923d5ffdcada83864b5e0eb07911682d66efa
diff --git a/tests/net/OWNERS b/tests/net/OWNERS
new file mode 100644
index 0000000..fa26997
--- /dev/null
+++ b/tests/net/OWNERS
@@ -0,0 +1,7 @@
+set noparent
+
+per-file Android.mk = build.master@android.com
+
+ek@google.com
+hugobenichi@google.com
+lorenzo@google.com