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/NetlinkManager.cpp b/server/NetlinkManager.cpp
index 769a80a..35349d2 100644
--- a/server/NetlinkManager.cpp
+++ b/server/NetlinkManager.cpp
@@ -46,6 +46,9 @@
 
 #include "pcap-netfilter-linux-android.h"
 
+namespace android {
+namespace net {
+
 const int NetlinkManager::NFLOG_QUOTA_GROUP = 1;
 const int NetlinkManager::NETFILTER_STRICT_GROUP = 2;
 
@@ -208,3 +211,6 @@
 
     return status;
 }
+
+}  // namespace net
+}  // namespace android