Also configure default registry on HA masters

Fixes https://bugzilla.redhat.com/show_bug.cgi?id=1463498

roles/openshift_master/templates/native-cluster/atomic-openshift-master-api.j2

@@ -1,5 +1,8 @@
 OPTIONS=--loglevel={{ openshift.master.debug_level }} --listen={{ 'https' if openshift.master.api_use_ssl else 'http' }}://{{ openshift.master.bind_addr }}:{{ openshift.master.api_port }} --master={{ openshift.master.loopback_api_url }}
 CONFIG_FILE={{ openshift_master_config_file }}
+{% if openshift_push_via_dns | default(false) %}
+OPENSHIFT_DEFAULT_REGISTRY=docker-registry.default.svc:5000
+{% endif %}
 {% if openshift.common.is_containerized | bool %}
 IMAGE_VERSION={{ openshift_image_tag }}
 {% endif %}

roles/openshift_master/templates/native-cluster/atomic-openshift-master-controllers.j2

@@ -1,5 +1,8 @@
 OPTIONS=--loglevel={{ openshift.master.debug_level }} --listen={{ 'https' if openshift.master.api_use_ssl else 'http' }}://{{ openshift.master.bind_addr }}:{{ openshift.master.controllers_port }}
 CONFIG_FILE={{ openshift_master_config_file }}
+{% if openshift_push_via_dns | default(false) %}
+OPENSHIFT_DEFAULT_REGISTRY=docker-registry.default.svc:5000
+{% endif %}
 {% if openshift.common.is_containerized | bool %}
 IMAGE_VERSION={{ openshift_image_tag }}
 {% endif %}