Add JWT_COOKIES_FLAG feature toggle.

This is intended to be a temporary flag for rollout of the JWT Cookies
feature.

ARCH-235

openedx/core/djangoapps/user_authn/waffle.py

@@ -0,0 +1,13 @@
+"""
+Feature toggles for user_authn.
+"""
+from openedx.core.djangoapps.waffle_utils import WaffleFlagNamespace, WaffleFlag
+
+# Namespace
+_WAFFLE_NAMESPACE = u'user_authn'
+_WAFFLE_FLAG_NAMESPACE = WaffleFlagNamespace(_WAFFLE_NAMESPACE)
+
+# Flags
+
+# Intended as a temporary toggle for roll-out of jwt cookies feature.
+JWT_COOKIES_FLAG = WaffleFlag(_WAFFLE_FLAG_NAMESPACE, u'jwt_cookies')