Stop setting default capabilities in get_named_key.

When get_named_key is called on a keyring that
has customised capabilities, it overwrites the
capabilities to the default capabilities.

Depends-On: I777650ae2194609a95e5cfb101e343824b3d0a34
Change-Id: I2930b32943fb75778cf3b56bb7f1d2a9f9c7c454

lib/charms_ceph/utils.py

@@ -1229,12 +1229,6 @@ def get_named_key(name, caps=None, pool_list=None):
                 'get',
                 key_name,
             ]).decode('UTF-8')).strip()
-        # NOTE(jamespage);
-        # Apply any changes to key capabilities, dealing with
-        # upgrades which requires new caps for operation.
-        upgrade_key_caps(key_name,
-                         caps or _default_caps,
-                         pool_list)
         return parse_key(output)
     except subprocess.CalledProcessError:
         # Couldn't get the key, time to create it!