net: Add missing locks in net.{cpp,h}

* writing variable 'nTotalBytesRecv' requires holding mutex 'cs_totalBytesRecv' exclusively
* writing variables 'nTotalBytesSent'/'nMaxOutboundTotalBytesSentInCycle'/'nMaxOutboundCycleStartTime' require holding mutex 'cs_totalBytesSent' exclusively
* writing variable 'nMaxOutboundTimeframe'/'nMaxOutboundLimit' require holding mutex 'cs_totalBytesSent' exclusively
* writing variable 'vAddedNodes' requires holding mutex 'cs_vAddedNodes' exclusively

src/net.cpp

@@ -2269,10 +2269,16 @@ bool CConnman::Start(CScheduler& scheduler, const Options& connOptions)
 {
     Init(connOptions);
 
-    nTotalBytesRecv = 0;
-    nTotalBytesSent = 0;
-    nMaxOutboundTotalBytesSentInCycle = 0;
-    nMaxOutboundCycleStartTime = 0;
+    {
+        LOCK(cs_totalBytesRecv);
+        nTotalBytesRecv = 0;
+    }
+    {
+        LOCK(cs_totalBytesSent);
+        nTotalBytesSent = 0;
+        nMaxOutboundTotalBytesSentInCycle = 0;
+        nMaxOutboundCycleStartTime = 0;
+    }
 
     if (fListen && !InitBinds(connOptions.vBinds, connOptions.vWhiteBinds)) {
         if (clientInterface) {

src/net.h

@@ -158,10 +158,16 @@ public:
         m_msgproc = connOptions.m_msgproc;
         nSendBufferMaxSize = connOptions.nSendBufferMaxSize;
         nReceiveFloodSize = connOptions.nReceiveFloodSize;
-        nMaxOutboundTimeframe = connOptions.nMaxOutboundTimeframe;
-        nMaxOutboundLimit = connOptions.nMaxOutboundLimit;
+        {
+            LOCK(cs_totalBytesSent);
+            nMaxOutboundTimeframe = connOptions.nMaxOutboundTimeframe;
+            nMaxOutboundLimit = connOptions.nMaxOutboundLimit;
+        }
         vWhitelistedRange = connOptions.vWhitelistedRange;
-        vAddedNodes = connOptions.m_added_nodes;
+        {
+            LOCK(cs_vAddedNodes);
+            vAddedNodes = connOptions.m_added_nodes;
+        }
     }
 
     CConnman(uint64_t seed0, uint64_t seed1);