RPC: add 'getpeerinfo', returning easy-to-retrieve per-CNode data

src/net.cpp

@@ -606,7 +606,23 @@ bool CNode::Misbehaving(int howmuch)
     return false;
 }
 
-
+#undef X
+#define X(name) stats.name = name
+void CNode::copyStats(CNodeStats &stats)
+{
+    X(nServices);
+    X(nLastSend);
+    X(nLastRecv);
+    X(nTimeConnected);
+    X(addrName);
+    X(nVersion);
+    X(strSubVer);
+    X(fInbound);
+    X(nReleaseTime);
+    X(nStartingHeight);
+    X(nMisbehavior);
+}
+#undef X