Description of problem:
Run upgrade_control_plane.yml to upgrade masters only against a ha rpm installed env, upgrade failed for "No package matching 'atomic-openshift-3.7.0' found available, installed or updated" in node hosts, which should not be ran.

TASK [openshift_version : Install the base package for versioning] *************
skipping: [qe-jliu-ha-lb-1.0925-pt5.qe.rhcloud.com] => {
    "changed": false, 
    "skip_reason": "Conditional result was False", 
    "skipped": true
}
fatal: [qe-node-1.x.x.x]: FAILED! => {
    "changed": false, 
    "failed": true, 
    "rc": 126, 
    "results": [
        "No package matching 'atomic-openshift-3.7.0' found available, installed or updated"
    ]
}

MSG:

No package matching 'atomic-openshift-3.7.0' found available, installed or updated

fatal: [qe-node-2.x.x.x]: FAILED! => {
    "changed": false, 
    "failed": true, 
    "rc": 126, 
    "results": [
        "No package matching 'atomic-openshift-3.7.0' found available, installed or updated"
    ]
}

MSG:

No package matching 'atomic-openshift-3.7.0' found available, installed or updated

<--snip->

Version-Release number of the following components:
ansible-2.3.2.0-2.el7.noarch
openshift-ansible-3.7.0-0.127.0.git.0.b9941e4.el7.noarch

How reproducible:
always

Steps to Reproduce:
1. Install ocp 3.6
2. Upgrade masters
ansible-playbook -i hosts $/playbooks/byo/openshift-cluster/upgrades/v3_7/upgrade_control_plane.yml
3.

Actual results:
Upgrade failed as installer tried to install packages on nodes.
Expected results:
Upgrade masters succeed with no changes on dedicated nodes.

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