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/VirtualNetwork.cpp b/server/VirtualNetwork.cpp
index 6daa50d..49418eb 100644
--- a/server/VirtualNetwork.cpp
+++ b/server/VirtualNetwork.cpp
@@ -23,6 +23,9 @@
 #define LOG_TAG "Netd"
 #include "log/log.h"
 
+namespace android {
+namespace net {
+
 VirtualNetwork::VirtualNetwork(unsigned netId, bool hasDns, bool secure) :
         Network(netId), mHasDns(hasDns), mSecure(secure) {
 }
@@ -121,3 +124,6 @@
     mInterfaces.erase(interface);
     return 0;
 }
+
+}  // namespace net
+}  // namespace android