https://github.com/openshift/openshift-ansible/pull/6891

Retest this bug with "openshift-ansible-3.6.173.0.101-1.git.0.7c6b77f.el7.noarch, and FAIL.

# cat /etc/origin/master/master-config.yaml
<--snip-->
  namedCertificates:
  - certFile: /etc/origin/master/named_certificates/cloudbeta.rio.gov.br.crt
    keyFile: /etc/origin/master/named_certificates/cloudbeta.rio.gov.br.key
    names:
    - "email:hostmaster.rj.gov.br"
    - "cloudbeta.rio.gov.br"
<--snip-->

Seem like the PR is not landed into the rpm package.

Waiting for 3.6 build

$ git tag --contains 6be727ca13ca1260333ab7b16636c2ab7a449a70
openshift-ansible-3.6.173.0.103-1

Verified this bug with openshift-ansible-3.6.173.0.104-1.git.0.ee43cc5.el7.noarch, and PASS.

# cat /etc/origin/master/master-config.yaml
<--snip-->
  namedCertificates:
  - certFile: /etc/origin/master/named_certificates/cloudbeta.rio.gov.br.crt
    keyFile: /etc/origin/master/named_certificates/cloudbeta.rio.gov.br.key
    names:
    - "cloudbeta.rio.gov.br"
<--snip-->

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2018:1106