Description of problem:
Zone ID is getting printed when zones are listed from 1.3 radosgw-admin on 2.0 RGW

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


How reproducible:
always

Steps to Reproduce:
1. Get a 1.3 cluster with one RGW node
2. Install ceph-common, ceph-radosgw packages and copy /etc/ceph/ contents of existing node on a fresh node after enabling 1.3 tool repos.
3. Upgrade existing cluster and create some zones.
4. Run sudo radosgw-admin zone list' on the node on which ceph-radosgw package is installed.

Actual results:
$ sudo radosgw-admin zone list
{
    "zones": [
        "b4d3bf71-e7b1-4795-b66b-638135b140bc",
        "default",
        "420b2a97-a4a2-400a-97a2-7efaeeb01cb0"
    ]
}


Expected results:
$ sudo radosgw-admin zone list
{
    "zones": [
        "<zone_name1>",
        "default",
        "<zone_name2>"
    ]
}


Additional info: