Description of problem:
RHCS deployment  is failing at below task as

TASK [ceph-facts : resolve device link(s)]

fatal: [ceph-ubuntu-ull9uz-node1-installer]: FAILED! => {
    "msg": "'devices' is undefined"
}
fatal: [ceph-ubuntu-ull9uz-node2]: FAILED! => {
    "msg": "'devices' is undefined"
}
fatal: [ceph-ubuntu-ull9uz-node6]: FAILED! => {
    "msg": "'devices' is undefined"
}
fatal: [ceph-ubuntu-ull9uz-node4]: FAILED! => {
    "msg": "'devices' is undefined"
}
fatal: [ceph-ubuntu-ull9uz-node3]: FAILED! => {
    "msg": "'devices' is undefined"
}
fatal: [ceph-ubuntu-ull9uz-node5]: FAILED! => {
    "msg": "'devices' is undefined"
}
fatal: [ceph-ubuntu-ull9uz-node12]: FAILED! => {
    "msg": "'devices' is undefined"
}
fatal: [ceph-ubuntu-ull9uz-node13]: FAILED! => {
    "msg": "'devices' is undefined"
}
fatal: [ceph-ubuntu-ull9uz-node14]: FAILED! => {
    "msg": "'devices' is undefined"
}

fatal: [ceph-ubuntu-ull9uz-node7]: FAILED! => {
    "msg": "'devices' is undefined"
}

fatal: [ceph-ubuntu-ull9uz-node8]: FAILED! => {
    "msg": "'devices' is undefined"
}
fatal: [ceph-ubuntu-ull9uz-node9]: FAILED! => {
    "msg": "'devices' is undefined"
}


Version-Release number of selected component (if applicable):
ansible-2.6.20-1.el7ae.noarch
ceph-ansible-3.2.57-1.el7cp.noarch


How reproducible:
2/2

Steps to Reproduce:
1. deploy rhcs3 with non-device osd scenario

Actual results:
site-container.yml fails with above error

Expected results:
site-container.yml should be successful and deployment should be successful.

Logs: http://magna002.ceph.redhat.com/cephci-jenkins/cephci-run-ULL9UZ/