Description of problem:
Run upgrade against cluster with 4 etcd hosts, upgrade will fail at task [Evaluate groups - Fail if no etcd hosts group is defined].

fatal: [localhost]: FAILED! => {"changed": false, "failed": true, "msg": "Running etcd as an embedded service is no longer supported. If this is a new install please define an 'etcd' group with either one or three hosts. These hosts may be the same hosts as your masters. If this is an upgrade you may set openshift_master_unsupported_embedded_etcd=true until a migration playbook becomes available.\n"}

===============
g_etcd_hosts length check should not limit in [3,1].

# vim playbooks/common/openshift-cluster/evaluate_groups.yml
 - name: Evaluate groups - Fail if no etcd hosts group is defined
    fail:
      msg: >
        Running etcd as an embedded service is no longer supported. If this is a
        new install please define an 'etcd' group with either one or three
        hosts. These hosts may be the same hosts as your masters. If this is an
        upgrade you may set openshift_master_unsupported_embedded_etcd=true
        until a migration playbook becomes available.
    when:
    - g_etcd_hosts | default([]) | length not in [3,1]
    - not openshift_master_unsupported_embedded_etcd | default(False)
    - not (openshift_node_bootstrap | default(False))


Version-Release number of the following components:
openshift-ansible-docs-3.7.0-0.178.0.git.0.27a1039.el7.noarch

How reproducible:
always

Steps to Reproduce:
1. Upgrade against ocp with more than 3 etcd hosts
2.
3.

Actual results:
Upgrade failed.

Expected results:
Upgrade succeed.

Additional info:
Please attach logs from ansible-playbook with the -vvv flag