pkg/stringid: move to daemon, and provide copy in client

The stringid package is used in many places; while it's trivial
to implement a similar utility, let's just provide it as a utility
package in the client, removing the daemon-specific logic.

For integration tests, I opted to use the implementation in the
client, as those should not ideally not make assumptions about
the daemon implementation.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

daemon/container/view_test.go

@@ -8,7 +8,7 @@ import (
 	"testing"
 
 	cerrdefs "github.com/containerd/errdefs"
-	"github.com/docker/docker/pkg/stringid"
+	"github.com/docker/docker/daemon/internal/stringid"
 	"github.com/google/uuid"
 	"github.com/moby/moby/api/types/container"
 	"gotest.tools/v3/assert"