Add support for GlobalConfig using ThirdPartyResources.

lib/backend/api/api.go

@@ -101,6 +101,10 @@ type Client interface {
 	// the datastore and then generates subsequent KVPair updates for
 	// changes to the datastore.
 	Syncer(callbacks SyncerCallbacks) Syncer
+
+	// EnsureInitialized ensures that the backend is initialized
+	// any ready to be used.
+	EnsureInitialized() error
 }
 
 type Syncer interface {

lib/backend/compat/compat.go

@@ -35,6 +35,10 @@ func NewAdaptor(c api.Client) *ModelAdaptor {
 	return &ModelAdaptor{client: c}
 }
 
+func (c *ModelAdaptor) EnsureInitialized() error {
+	return c.client.EnsureInitialized()
+}
+
 // Create an entry in the datastore.  This errors if the entry already exists.
 func (c *ModelAdaptor) Create(d *model.KVPair) (*model.KVPair, error) {
 	var err error

lib/backend/etcd/etcd.go

@@ -102,6 +102,10 @@ func NewEtcdClient(config *EtcdConfig) (*EtcdClient, error) {
 	return &EtcdClient{etcdClient: client, etcdKeysAPI: keys}, nil
 }
 
+func (c *EtcdClient) EnsureInitialized() error {
+	return nil
+}
+
 func (c *EtcdClient) Syncer(callbacks api.SyncerCallbacks) api.Syncer {
 	return newSyncer(c.etcdKeysAPI, callbacks)
 }