Merge #8173: Use SipHash for node eviction (cont'd)

eebc232 test: Add more test vectors for siphash (Wladimir J. van der Laan)
8884830 Use C++11 thread-safe static initializers (Pieter Wuille)
c31b24f Use 64-bit SipHash of netgroups in eviction (Pieter Wuille)
9bf156b Support SipHash with arbitrary byte writes (Pieter Wuille)
053930f Avoid recalculating vchKeyedNetGroup in eviction logic. (Patrick Strateman)

src/net.h

@@ -335,7 +335,7 @@ public:
     int64_t nLastRecv;
     int64_t nTimeConnected;
     int64_t nTimeOffset;
-    CAddress addr;
+    const CAddress addr;
     std::string addrName;
     CService addrLocal;
     int nVersion;
@@ -362,6 +362,8 @@ public:
     CBloomFilter* pfilter;
     int nRefCount;
     NodeId id;
+
+    const uint64_t nKeyedNetGroup;
 protected:
 
     // Denial-of-service detection/prevention
@@ -450,6 +452,8 @@ private:
     CNode(const CNode&);
     void operator=(const CNode&);
 
+    static uint64_t CalculateKeyedNetGroup(const CAddress& ad);
+
 public:
 
     NodeId GetId() const {