Graceful deletion of resources

This commit adds support to core resources to enable deferred deletion
of resources.  Clients may optionally specify a time period after which
resources must be deleted via an object sent with their DELETE. That
object may define an optional grace period in seconds, or allow the
default "preferred" value for a resource to be used. Once the object
is marked as pending deletion, the deletionTimestamp field will be set
and an etcd TTL will be in place.

Clients should assume resources that have deletionTimestamp set will
be deleted at some point in the future.  Other changes will come later
to enable graceful deletion on a per resource basis.

pkg/api/helpers.go

@@ -76,3 +76,11 @@ var standardResources = util.NewStringSet(
 func IsStandardResourceName(str string) bool {
 	return standardResources.Has(str)
 }
+
+// NewDeleteOptions returns a DeleteOptions indicating the resource should
+// be deleted within the specified grace period. Use zero to indicate
+// immediate deletion. If you would prefer to use the default grace period,
+// use &api.DeleteOptions{} directly.
+func NewDeleteOptions(grace int64) *DeleteOptions {
+	return &DeleteOptions{GracePeriodSeconds: &grace}
+}