Description of problem:

When you create a zonegroup configuration that changes the default_placement. And update the default_placement to reflect this change. If you do not manually specify the placement_tag for a user, the user will not be able to write.

"placement_targets": [
        {
            "name": "indexed",
            "tags": [
                "indexed"
            ]
        },
        {
            "name": "blind",
            "tags": [
                "blind"
            ]
        }
    ],
    "default_placement": "indexed",

User config:

   "default_placement": "",
    "placement_tags": [],

Version-Release number of selected component (if applicable):

ceph version 10.2.2-38.el7cp (119a68752a5671253f9daae3f894a90313a6b8e4)

How reproducible:

Everytime

Steps to Reproduce:
1. Update zonegroup and change the default placement target name and tag.
2. Update default_placement to the new name
3. Update zone to the placement_pools key matches the new target name
4. create a user using and try creating a bucket

Actual results:

Fails with this error.

0 user not permitted to use placement rule

Expected results:

For the default_placement in the zonegroup to be used without having to manually update the user info to allow the tag.

Additional info:

If only the "placement_tags": [] is updated for the user, the user is then able to create a bucket.