Only add host entries for role_networks

When network isolastion was added there was no have
composable networks and no jinja2 generated heat
templates. Because of this the "standard" networks
was always included, but the port template was
overridden to use the ctlplane's ip address for
disabled networks.

The result is that we have kept host entries for
networks that are irrelevant for some roles. This
was fixed in https://review.opendev.org/614457 but
re-intruduced in tripleo-ansibe.

This fixes the tripleo_hosts_entries role to only
write host entries for networks relavant to the
tripleo role.

Related-Bug: #1842001
Related-Bug: #1800811
Change-Id: I2c8f0eb33be26ebe6d4077b25de47c2b2ab1fca0

tripleo_ansible/roles/tripleo_hosts_entries/molecule/default/molecule.yml

@@ -44,9 +44,13 @@ provisioner:
           tripleo_hosts_entries_extra_hosts_entries: []
           tripleo_hosts_entries_vip_hosts_entries: []
           cloud_domain: localdomain
+          enabled_networks:
+            - ctlplane
+            - InternalApi
           role_networks:
             - ctlplane
             - InternalApi
+            - DisabledNet
           networks:
             ctlplane:
               name_lower: ctlplane

tripleo_ansible/roles/tripleo_hosts_entries/tasks/main.yml

@@ -38,8 +38,10 @@
       {% for host in groups['overcloud'] -%}
       {{ hostvars[host][hostvars[host]['hostname_resolve_network'] ~ '_ip'] ~ ' ' ~
          host ~ '.' ~ cloud_domain ~ ' ' ~ host }}
-      {% if role_networks is not none -%}
-      {% set _networks = (enabled_networks | default([])) | union(role_networks | default([])) -%}
+      {# ## NOTE(hjensas): The Undercloud Minion has no networks, need to check for that here. -#}
+      {% if hostvars[host]['role_networks'] is not none -%}
+      {% set _role_networks = hostvars[host]['role_networks'] | default ([]) -%}
+      {% set _networks = (enabled_networks | default([])) | intersect(_role_networks) -%}
       {% for network in _networks -%}
       {{ hostvars[host][networks[network]['name_lower'] ~ '_ip'] ~ ' ' ~
          host ~ '.' ~ network.lower() ~ '.' ~ cloud_domain ~ ' ' ~