Enable simple htpasswd in ansible inventory file
[OSEv3:vars]
...
# htpasswd auth
openshift_master_identity_providers=[{'name': 'htpasswd_auth', 'login': 'true', 'challenge': 'true', 'kind': 'HTPasswdPasswordIdentityProvider', 'filename': '/etc/origin/htpasswd'}]
Generate password file
for i in 1 2 3; do htpasswd -b /etc/origin/htpasswd user$i ; done