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/LocalNetwork.cpp b/server/LocalNetwork.cpp
index ba0b21e..91fda3c 100644
--- a/server/LocalNetwork.cpp
+++ b/server/LocalNetwork.cpp
@@ -21,6 +21,9 @@
 #define LOG_TAG "Netd"
 #include "log/log.h"
 
+namespace android {
+namespace net {
+
 LocalNetwork::LocalNetwork(unsigned netId) : Network(netId) {
 }
 
@@ -54,3 +57,6 @@
     mInterfaces.erase(interface);
     return 0;
 }
+
+}  // namespace net
+}  // namespace android