Description of problem:
Upgrade against rpm ocp when set "openshift_node_bootstrap=false" in hosts file, which means user want to keep node run as original way. After upgrade finished, checked that node was not run as original way but still run as a bootstrap node.

before upgrade:
# ps aux|grep "start node"
root      21861  1.6  2.3 579760 86248 ?        Ssl  Apr26   5:46 /usr/bin/openshift start node --config=/etc/origin/node/node-config.yaml --loglevel=5
root      65062  0.0  0.0 112708   980 pts/0    S+   03:45   0:00 grep --color=auto openshift

after upgrade:
# ps aux|grep "node"
root      74544  2.8  2.6 845668 97816 ?        Ssl  03:42   1:00 /usr/bin/hyperkube kubelet --v=5 --address=0.0.0.0 --allow-privileged=true --anonymous-auth=true --authentication-token-webhook=true --authentication-token-webhook-cache-ttl=5m --authorization-mode=Webhook ........

root      77029  0.2  1.7 673756 62260 ?        Ssl  03:43   0:04 openshift start network --config=/etc/origin/node/node-config.yaml --kubeconfig=/tmp/kubeconfig --loglevel=2

root      77120  0.0  0.0  11684  1492 ?        Ss   03:43   0:00 /bin/bash -c #!/bin/bash set -euo pipefail  .....


# systemctl status openvswitch
Unit openvswitch.service could not be found.

# oc get pod -n openshift-sdn
NAME        READY     STATUS    RESTARTS   AGE
ovs-2jxrj   1/1       Running   0          25m
ovs-mx74p   1/1       Running   2          25m
sdn-4nxkd   1/1       Running   0          25m
sdn-m96w9   1/1       Running   2          25m

# docker images|grep ose-node
registry.reg-aws.openshift.com:443/openshift3/ose-node            v3.10               30eab79c6a92        3 hours ago         1.61 GB


Version-Release number of the following components:
openshift-ansible-3.10.0-0.30.0.git.0.4f02952.el7.noarch

How reproducible:
always

Steps to Reproduce:
1. Rpm install ocp v3.9 
2. Set "openshift_node_bootstrap=false" in hosts file
3. Run upgrade against above ocp

Actual results:
Node was run as a bootstrap node.

Expected results:
Node should keep a pet-node the same with it before upgrade.

Additional info:
Need a check about "openshift_node_bootstrap" when upgrade nodes.