Use rdns instead of IP for ssh

Use the rdns name for the linode rather than the IP when doing ssh since this allows corporate DNS servers to reroute traffic through their own proxies.

Author: bluesmoon

apps/manual-kafka-cluster/provision.yml

@@ -64,13 +64,13 @@
         #jinja2: trim_blocks:False
         [kafka]
         {%- for count in range(cluster_size) %}
-        {{ info.results[count].instance.ipv4[0] }} {% if count < controller_count %}role='controller and broker'{%else%}role='broker only'{%endif%}
+        {{ info.results[count].networking.ipv4.public[0].rdns }} {% if count < controller_count %}role='controller and broker'{%else%}role='broker only'{%endif%}
         {%- endfor %}
 
   - name: wait for port 22 to become open
     wait_for:
       port: 22
-      host: '{{ item.instance.ipv4[0] }}'
+      host: '{{ item.networking.ipv4.public[0].rdns }}'
       search_regex: OpenSSH
       delay: 10
     connection: local