Description of problem:
   On the long running cluster, we are seeing multisite sync stuck due to the error : " ERROR: failed to parse bucket shard 'swift.bucky.0:55c9e095-9d20-4a0f-91ef-35e786611b6f.188905.1': Expected option value to be integer, got '55c9e095-9d20-4a0f-91ef-35e786611b6f.188905.1'

Version-Release number of selected component (if applicable):
ceph version 12.2.8-128.el7cp

How reproducible:
Always

Steps to Reproduce:
1. This bucket is created as part of our automated suite.


This is a swift bucket :

root@extensa010 ubuntu]# radosgw-admin user info --uid 'tenant$tuffy'
{
    "user_id": "tenant$tuffy",
    "display_name": "tuffy",
    "email": "",
    "suspended": 0,
    "max_buckets": 1000,
    "auid": 0,
    "subusers": [
        {
            "id": "tenant$tuffy:swift",
            "permissions": "full-control"
        }
    ],
    "keys": [
        {
            "user": "tenant$tuffy",
            "access_key": "3OCLNZ3AUfPEA1SABGPT",
            "secret_key": "ByLA2LI9fZG7ZC7YVy0P7fMTFTORB8ML9fLKTTTB"
        },
        {
            "user": "tenant$tuffy",
            "access_key": "64Gf8P3BO4OKP1F2BSUH",
            "secret_key": "DYHMuuBED7D8KQR4GQuD0W18WN8fuYUWD1WUPRPR"
        }
    ],
    "swift_keys": [
        {
            "user": "tenant$tuffy:swift",
            "secret_key": "aojEP7WdrQ8CkqejFM8otxgzVV6q64awHMiso7SY"
        }




]# radosgw-admin metadata list bucket
[
.
.
    "tenant/tenant$tuffy:swift.bucky.0",


]# radosgw-admin metadata list bucket.instance
[
.
.
    "tenant/tenant$tuffy:swift.bucky.0:55c9e095-9d20-4a0f-91ef-35e786611b6f.188905.1",

PRIMARY:
0 ERROR: failed to get bucket instance info for .bucket.meta.tenant/tenant$tuffy:swift.bucky.0:55c9e095-9d20-4a0f-91ef-35e786611b6f.188905.1

SEC:
0 ERROR: failed to parse bucket shard 'swift.bucky.0:55c9e095-9d20-4a0f-91ef-35e786611b6f.188905.1': Expected option value to be integer, got '55c9e095-9d20-4a0f-91ef-35e786611b6f.188905.1'

]# radosgw-admin data sync status --source-zone us-west --shard-id 86
{
    "shard_id": 86,
    "marker": {
        "status": "incremental-sync",
        "marker": "",
        "next_step_marker": "",
        "total_entries": 0,
        "pos": 0,
        "timestamp": "0.000000"
    },
    "pending_buckets": [
        "tenant/tenant$tuffy:swift.bucky.0:55c9e095-9d20-4a0f-91ef-35e786611b6f.188905.1"
    ],
    "recovering_buckets": []
}
[root@extensa004 ubuntu]# radosgw-admin sync status detail
          realm 081290c7-a532-470e-a27a-e532d19b57f2 (movies)
      zonegroup e4460222-1aae-4c86-9c70-721cd9c13d86 (us)
           zone d9ba421f-312f-4fa3-a936-8f1f8cc71932 (us-east)
  metadata sync syncing
                full sync: 0/64 shards
                incremental sync: 64/64 shards
                metadata is caught up with master
      data sync source: 55c9e095-9d20-4a0f-91ef-35e786611b6f (us-west)
                        syncing
                        full sync: 0/128 shards
                        incremental sync: 128/128 shards
                        data is behind on 1 shards
                        behind shards: [86]
                        oldest incremental change not applied: 2019-06-19 06:54:03.0.417697s



# radosgw-admin bucket list --bucket 'tenant/tenant$tuffy:swift.bucky.0'
[
    {
        "name": "key.tuffy.container.0.29748",
        "instance": "",
        "ver": {
            "pool": 9,
            "epoch": 183491
        },
        "locator": "",
        "exists": "true",
        "meta": {
            "category": 1,
            "size": 10485760,
            "mtime": "2019-06-19 13:13:20.861120Z",
            "etag": "a29936cfc11cd3ce79a1af28a329c4c6",
            "owner": "tenant$tuffy",
            "owner_display_name": "tuffy",
            "content_type": "text/plain",
            "accounted_size": 10485760,
            "user_data": ""
        },
        "tag": "55c9e095-9d20-4a0f-91ef-35e786611b6f.367158.39373",
        "flags": 0,
        "pending_map": [],
        "versioned_epoch": 0
    }
]