[#2260] network/cache: Ignore clients only on `Dial` errors

The problem is that accidental timeout errors can make us to ignore
other nodes for some time. The primary purpose of the whole ignore
mechanism is not to degrade in case of failover. For this case,
closing connection and limiting the amount of dials is enough.

Signed-off-by: Evgenii Stratonikov <e.stratonikov@yadro.com>

pkg/network/cache/multi.go

@@ -202,7 +202,6 @@ func (s *singleClient) invalidate() {
 		_ = s.client.Close()
 	}
 	s.client = nil
-	s.lastAttempt = time.Now()
 	s.Unlock()
 }