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/SockDiag.cpp b/server/SockDiag.cpp
index c6a0a92..423ad3b 100644
--- a/server/SockDiag.cpp
+++ b/server/SockDiag.cpp
@@ -45,6 +45,9 @@
 
 #define INET_DIAG_BC_MARK_COND 10
 
+namespace android {
+namespace net {
+
 namespace {
 
 int checkError(int fd) {
@@ -497,3 +500,6 @@
 
     return 0;
 }
+
+}  // namespace net
+}  // namespace android