Catalog for V2 API Implementation

This change adds a basic catalog endpoint to the API, which returns a list,
or partial list, of all of the repositories contained in the registry.  Calls
to this endpoint are somewhat expensive, as every call requires walking a
large part of the registry.

Instead, to maintain a list of repositories, you would first call the catalog
endpoint to get an initial list, and then use the events API to maintain
any future repositories.

Signed-off-by: Patrick Devine <patrick.devine@docker.com>

docs/api/v2/routes.go

@@ -16,6 +16,7 @@ const (
 
 var allEndpoints = []string{
 	RouteNameManifest,
+	RouteNameCatalog,
 	RouteNameTags,
 	RouteNameBlob,
 	RouteNameBlobUpload,