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/Network.h b/server/Network.h
index 8949dd1..69af3ff 100644
--- a/server/Network.h
+++ b/server/Network.h
@@ -22,6 +22,9 @@
 #include <set>
 #include <string>
 
+namespace android {
+namespace net {
+
 // A Network represents a collection of interfaces participating as a single administrative unit.
 class Network {
 public:
@@ -57,4 +60,7 @@
     std::set<std::string> mInterfaces;
 };
 
+}  // namespace net
+}  // namespace android
+
 #endif  // NETD_SERVER_NETWORK_H