implement varlink commit

Signed-off-by: baude <bbaude@redhat.com>

Closes: #762
Approved by: baude

libpod/container_commit.go

@@ -2,7 +2,6 @@ package libpod
 
 import (
 	"context"
-	"fmt"
 	"strings"
 
 	is "github.com/containers/image/storage"
@@ -145,6 +144,5 @@ func (c *Container) Commit(ctx context.Context, destImage string, options Contai
 	if err != nil {
 		return nil, err
 	}
-	fmt.Fprintf(commitOptions.ReportWriter, importBuilder.Comment())
 	return c.runtime.imageRuntime.NewFromLocal(id)
 }