Changes:

1. internal/therealssh/client_test.go: removed unnecessary time.Sleep in TestClientOpenChannel
2. pkg/messaging/client_test.go: removed unnecessary time.Sleep in
TestClientDial

Tested:

```sh
$ loop -n 100 "go clean -testcache &>/dev/null || go test -race -cover -timeout=1m  ./internal/therealssh -run TestClientOpenChannel"
$ loop -n 100 "go clean -testcache &>/dev/null || go test -race -cover -timeout=1m  ./pkg/messaging  -run TestClientDial"
```

internal/therealssh/client_test.go

@@ -4,7 +4,6 @@ import (
 	"encoding/binary"
 	"net"
 	"testing"
-	"time"
 
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
@@ -29,7 +28,6 @@ func TestClientOpenChannel(t *testing.T) {
 		resCh <- data{ch, err}
 	}()
 
-	time.Sleep(100 * time.Millisecond)
 	buf := make([]byte, 5)
 	_, err := conn.Read(buf)
 	require.NoError(t, err)

pkg/messaging/client_test.go

@@ -7,7 +7,6 @@ import (
 	"os"
 	"sync"
 	"testing"
-	"time"
 
 	"github.com/skycoin/skycoin/src/util/logging"
 	"github.com/stretchr/testify/assert"
@@ -34,8 +33,6 @@ func TestClientDial(t *testing.T) {
 	require.NoError(t, err)
 	srvPK := srv.config.Public
 
-	time.Sleep(100 * time.Millisecond)
-
 	anotherPK, anotherSK := cipher.GenerateKeyPair()
 	anotherClient := NewClient(&Config{anotherPK, anotherSK, discovery, 0, 0})
 	require.NoError(t, anotherClient.ConnectToInitialServers(context.TODO(), 1))
@@ -56,8 +53,6 @@ func TestClientDial(t *testing.T) {
 		errCh <- err
 	}()
 
-	time.Sleep(100 * time.Millisecond)
-
 	require.NoError(t, <-errCh)
 	require.NotNil(t, c.getLink(srvPK).chans.get(0))
 
@@ -87,9 +82,6 @@ func TestClientDial(t *testing.T) {
 	require.NoError(t, tr.Close())
 	require.NoError(t, anotherTr.Close())
 
-	time.Sleep(100 * time.Millisecond)
-
-	// require.Nil(t, c.getLink(srvPK).chans.get(0))
 	require.Nil(t, anotherClient.getLink(srvPK).chans.get(0))
 }