docker-container: avoid fail if container conflict

Fixes the race condition where two boots are executed simultaneously
across multiple processes.

We initially check to see if the container exists, but if during
container creation we get a name conflict, we don't treat this error as
a hard failure, and instead move immediately into waiting for the node
to boot.

Signed-off-by: Justin Chadwell <me@jedevc.com>

driver/docker-container/driver.go

@@ -22,6 +22,7 @@ import (
 	"github.com/docker/docker/api/types/mount"
 	"github.com/docker/docker/api/types/network"
 	dockerclient "github.com/docker/docker/client"
+	"github.com/docker/docker/errdefs"
 	dockerarchive "github.com/docker/docker/pkg/archive"
 	"github.com/docker/docker/pkg/idtools"
 	"github.com/docker/docker/pkg/stdcopy"
@@ -148,14 +149,16 @@ func (d *Driver) create(ctx context.Context, l progress.SubLogger) error {
 
 		}
 		_, err := d.DockerAPI.ContainerCreate(ctx, cfg, hc, &network.NetworkingConfig{}, nil, d.Name)
-		if err != nil {
+		if err != nil && !errdefs.IsConflict(err) {
-			return err
-		}
-		if err := d.copyToContainer(ctx, d.InitConfig.Files); err != nil {
 			return err
 		}
-		if err := d.start(ctx, l); err != nil {
+		if err == nil {
-			return err
+			if err := d.copyToContainer(ctx, d.InitConfig.Files); err != nil {
+				return err
+			}
+			if err := d.start(ctx, l); err != nil {
+				return err
+			}
 		}
 		if err := d.wait(ctx, l); err != nil {
 			return err