[#280] client: Use DialTimeout for gRPC dial

After removing `grpc.Dial` from client `DialTimeout` used only if
custom dialer provided. Client uses `BalanceOf` instead of `grpc.Dial`,
so it is required to use `DialTimeout` to not to use RPC timeout.

Signed-off-by: Dmitrii Stepanov <d.stepanov@yadro.com>

client/client.go

@@ -100,6 +100,8 @@ func (c *Client) Dial(ctx context.Context, prm PrmDial) error {
 
 	c.setFrostFSAPIServer((*coreServer)(&c.c))
 
+	ctx, cancel := context.WithTimeout(ctx, prm.DialTimeout)
+	defer cancel()
 	_, err := rpc.Balance(&c.c, new(v2accounting.BalanceRequest),
 		client.WithContext(ctx),
 	)