Description of problem:

When trying to apply the SSL part of OSP 7.3 doc, I found two mistakes:

1. Indentation of certificate (SSLCert, SSLKey, CACert) aren't correct.

Even with the 'IMPORTANT' note, examples aren't correct.
Certificate need one more tabulation.
Ex: 
parameter_defaults:
    SSLCertificate: |
    -----BEGIN CERTIFICATE-----

Correct way:
parameter_defaults:
    SSLCertificate: |
      -----BEGIN CERTIFICATE-----


2. In cloudname.yaml file, due to 'DnsServers' parameter, deployment will fail if the param is already set in templates.

If we use network-isolation functionalities, DnsServers are already set in network-environment.yaml file.

If you add this param in cloudname.yaml file, deployment with fail on Heat validation template with this kind of error, due of duplicate value:

Failed to validate: Failed to validate: Value must be valid JSON: Extra data: line 1 column 6 - line 1 column 13 (char 5 - 12)) _dispatch_and_reply /usr/lib/python2.7/site-packages/oslo_messaging/rpc/dispatcher.py:145

Should be good to add a warning/important note to ensure to have this value only one time.

Version-Release number of selected component (if applicable):

https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux_OpenStack_Platform/7/html/Director_Installation_and_Usage/sect-Advanced-Scenario_3_Using_the_CLI_to_Create_an_Advanced_Overcloud_with_Ceph_Nodes.html#sect-Advanced-Enabling_SSL_TLS_on_the_Overcloud

How reproducible:

Trying to deploy SSL with an existing OSP templates (with network isolation)


Steps to Reproduce:
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Actual results:


Expected results:


Additional info: