Implement V2 interfaces and remaining V1 interfaces

Also adds some tests to registry tests for V1 stuff.
Note: All *registry* tests currently pass, but as verbs are not yet converted, the verb tests in registry_tests.py currently fail.

endpoints/v2/v2auth.py

@@ -11,6 +11,7 @@ from auth.permissions import (ModifyRepositoryPermission, ReadRepositoryPermissi
                               CreateRepositoryPermission)
 from endpoints.v2 import v2_bp
 from endpoints.decorators import anon_protect
+from data.interfaces import v2
 from util.cache import no_cache
 from util.names import parse_namespace_repository, REPOSITORY_NAME_REGEX
 from util.security.registry_jwt import generate_bearer_token, build_context_and_subject