Make Socks5() InterruptibleRecv() timeout/failures informative.

Before:
2016-05-16 06:10:45 ERROR: Error reading proxy response

After:
2016-05-16 06:10:45 Socks5() connect to k7s5d6jqig4ej4v4.onion:18333 failed: InterruptibleRecv() timeout or other failure

Author: wtogami

src/netbase.cpp

@@ -318,7 +318,8 @@ static bool Socks5(const std::string& strDest, int port, const ProxyCredentials
     char pchRet1[2];
     if (!InterruptibleRecv(pchRet1, 2, SOCKS5_RECV_TIMEOUT, hSocket)) {
         CloseSocket(hSocket);
-        return error("Error reading proxy response");
+        LogPrintf("Socks5() connect to %s:%d failed: InterruptibleRecv() timeout or other failure\n", strDest, port);
+        return false;
     }
     if (pchRet1[0] != 0x05) {
         CloseSocket(hSocket);