Creates unittests for addrman, makes addrman testable.

Adds several unittests for addrman to verify it works as expected.
Makes small modifications to addrman to allow deterministic and targeted tests.

Signed-off-by: Simon <simon@bitcartel.com>

src/addrman.h

@@ -22,6 +22,8 @@
  */
 class CAddrInfo : public CAddress
 {
+
+
 public:
     //! last try whatsoever by us (memory only)
     int64_t nLastTry;
@@ -230,8 +232,8 @@ protected:
     //! Mark an entry as attempted to connect.
     void Attempt_(const CService &addr, int64_t nTime);
 
-    //! Select an address to connect to.
-    CAddrInfo Select_();
+    //! Select an address to connect to, if newOnly is set to true, only the new table is selected from.
+    CAddrInfo Select_(bool newOnly);
 
 #ifdef DEBUG_ADDRMAN
     //! Perform consistency check. Returns an error code or zero.
@@ -532,13 +534,13 @@ public:
     /**
      * Choose an address to connect to.
      */
-    CAddrInfo Select()
+    CAddrInfo Select(bool newOnly = false)
     {
         CAddrInfo addrRet;
         {
             LOCK(cs);
             Check();
-            addrRet = Select_();
+            addrRet = Select_(newOnly);
             Check();
         }
         return addrRet;
@@ -567,6 +569,12 @@ public:
             Check();
         }
     }
+    
+    //! Ensure that bucket placement is always the same for testing purposes.
+    void MakeDeterministic(){
+        nKey.SetNull(); //Do not use outside of tests.
+    }
+
 };
 
 #endif // BITCOIN_ADDRMAN_H