net: narrow include scope after moving to netaddress

Net functionality is no longer needed for CAddress/CAddrman/etc. now that
CNetAddr/CService/CSubNet are dumb storage classes.

src/net.cpp

@@ -17,6 +17,7 @@
 #include "crypto/sha256.h"
 #include "hash.h"
 #include "primitives/transaction.h"
+#include "netbase.h"
 #include "scheduler.h"
 #include "ui_interface.h"
 #include "utilstrencodings.h"