Don't cache session-cache single use vault token

salt/pillar/vault.py

@@ -26,6 +26,8 @@ require. Avoid naming every key 'password' as you they will collide:
 
 If you want to nest results under a nesting_key name use the following format:
 
+.. code-block:: yaml
+
     ext_pillar:
       - vault:
           conf: path=secret/salt

salt/utils/vault.py

@@ -227,7 +227,6 @@ def write_cache(connection):
         and "vault_secret_path_metadata" not in connection
     ):
         log.debug("Not caching vault single use token")
-        __context__["vault_token"] = connection
         return True
     elif (
         "vault_secret_path_metadata" in __context__