Another possible panic (though quite rare).
```
--- FAIL: TestTwoNodes (0.00s)
pool.go:185: Unexpected call to *pool.MockClient.EndpointInfo([context.Background.WithCancel.WithDeadline(2021-10-26 15:50:50.005585875 +0300 MSK m=+1.216577808 [-940.323µs])]) at /home/dzeta/repo/neofs-sdk-go/pool/pool.go:185 because: there are no expected calls of the method "EndpointInfo" for that receiver
pool.go:185: Unexpected call to *pool.MockClient.EndpointInfo([context.Background.WithCancel.WithDeadline(2021-10-26 15:50:50.005715623 +0300 MSK m=+1.216707547 [-1.351991ms])]) at /home/dzeta/repo/neofs-sdk-go/pool/pool.go:185 because: there are no expected calls of the method "EndpointInfo" for that receiver
```
Signed-off-by: Evgenii Stratonikov <evgeniy@nspcc.ru>
We have go1.16 in go.mod and `gomock.NewController` comment indicates:
```
New in go1.14+, if you are passing a *testing.T into this function you no
longer need to call ctrl.Finish() in your test methods.
```
Signed-off-by: Evgenii Stratonikov <evgeniy@nspcc.ru>