Description of problem:
In openshift-ansible/inventory/byo/hosts.example, the following lines:

# Native high availbility cluster method with optional load balancer.
# If no lb group is defined installer assumes that a load balancer has
# been preconfigured. For installation the value of
# openshift_master_cluster_hostname must resolve to the load balancer
# or to one or all of the masters defined in the inventory if no load
# balancer is present.
#openshift_master_cluster_method=native
#openshift_master_cluster_hostname=openshift-ansible.test.example.com
#openshift_master_cluster_public_hostname=openshift-ansible.test.example.com

If user is following these lines to install native master ha, would encounter such error:
TASK: [openshift_master | fail ] ********************************************** 
failed: [test61.cluster.local] => {"failed": true}
msg: openshift_master_cluster_method must be set to either 'native' or 'pacemaker' for multi-master installations

FATAL: all hosts have already failed -- aborting

According to the above error message, user do not know where is wrong.
Dig into code, found need add one more parameter in ansilbe host file:
openshift_master_ha=True



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