Put most of netd into the android::net namespace.

Test: netd_{unit,integration}_test pass
Test: bullhead builds, boots
Bug: 34873832
Change-Id: I0a252328041b342f9c03cd08c11a69d452b045b3
diff --git a/server/InterfaceController.cpp b/server/InterfaceController.cpp
index 1d0a8e0..ed5d8d0 100644
--- a/server/InterfaceController.cpp
+++ b/server/InterfaceController.cpp
@@ -32,6 +32,7 @@
 using android::base::StringPrintf;
 using android::base::ReadFileToString;
 using android::base::WriteStringToFile;
+using android::net::RouteController;
 
 namespace {