warn user kubernetes is deprecated and options won't be stored in context

Signed-off-by: Nicolas De Loof <nicolas.deloof@gmail.com>

cli/command/context/create.go

@@ -3,6 +3,7 @@ package context
 import (
 	"bytes"
 	"fmt"
+	"github.com/sirupsen/logrus"
 	"text/tabwriter"
 
 	"github.com/docker/cli/cli"
@@ -107,6 +108,9 @@ func createNewContext(o *CreateOptions, stackOrchestrator command.Orchestrator,
 	if dockerTLS != nil {
 		contextTLSData.Endpoints[docker.DockerEndpoint] = *dockerTLS
 	}
+	if len(o.Kubernetes) != 0 {
+		logrus.Warn("kubernetes orchestrator is deprecated")
+	}
 	if err := validateEndpointsAndOrchestrator(contextMetadata); err != nil {
 		return err
 	}