Installing an iSCSI gateway for Red Hat Ceph Storage using Ansible fails with a compatibility check for RHEL version.

Issue

• Installing an iSCSI gateway for RHCS on RHEL7.4 using Ansible fails a compatibility check.

# ansible-playbook ceph-iscsi-gw.yml

PLAY [ceph-iscsi-gw] ***********************************************************

TASK [setup] *******************************************************************
ok: [target2]
ok: [target1]

TASK [ceph-iscsi-gw : OS Compatibility Check (RHEL 7.3)] ***********************
fatal: [target1]: FAILED! => {
    "assertion": "ansible_distribution_version == '7.3'", 
    "changed": false, 
    "evaluated_to": false, 
    "failed": true
}
fatal: [target2]: FAILED! => {
    "assertion": "ansible_distribution_version == '7.3'", 
    "changed": false, 
    "evaluated_to": false, 
    "failed": true
}
    to retry, use: --limit @/usr/share/ceph-ansible/ceph-iscsi-gw.retry

PLAY RECAP *********************************************************************
target1                    : ok=1    changed=0    unreachable=0    failed=1   
target2                    : ok=1    changed=0    unreachable=0    failed=1