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/DummyNetwork.cpp b/server/DummyNetwork.cpp
index a3b3435..6cd6791 100644
--- a/server/DummyNetwork.cpp
+++ b/server/DummyNetwork.cpp
@@ -22,6 +22,9 @@
 #include "log/log.h"
 #include "errno.h"
 
+namespace android {
+namespace net {
+
 const char* DummyNetwork::INTERFACE_NAME = "dummy0";
 
 DummyNetwork::DummyNetwork(unsigned netId) : Network(netId) {
@@ -42,3 +45,6 @@
 int DummyNetwork::removeInterface(const std::string& /* interface */) {
     return -EINVAL;
 }
+
+}  // namespace net
+}  // namespace android