Fix reporting of TLS connection errors

The code for connecting to a server tries each socket in turn
until it finds one that connects. Unfortunately for TLS sockets
if it connected, but failed TLS handshake it would treat that
as a failure to connect, and try the next socket. This is bad,
it should have reported the TLS failure immediately.

$ virsh -c qemu://somehost.com/system
error: unable to connect to libvirtd at 'somehost.com': Invalid argument
error: failed to connect to the hypervisor

$ ./tools/virsh -c qemu://somehost.com/system
error: server certificate failed validation: The certificate hasn't got a known issuer.
error: failed to connect to the hypervisor

 * src/remote/remote_driver.c: Stop trying to connect if the
   TLS handshake fails

src/remote/remote_driver.c

@@ -632,7 +632,7 @@ doRemoteOpen (virConnectPtr conn,
                 if (!priv->session) {
                     close (priv->sock);
                     priv->sock = -1;
-                    continue;
+                    goto failed;
                 }
             }
             goto tcp_connected;