[CORD-1608]
Fix DNS and ansible timeout issues when building docker images

Change-Id: I549387d458c280ac769e9c3a06a5e035457c0815
diff --git a/ansible/roles/genconfig/templates/config.mk.j2 b/ansible/roles/genconfig/templates/config.mk.j2
index b778176..fa6bcbf 100644
--- a/ansible/roles/genconfig/templates/config.mk.j2
+++ b/ansible/roles/genconfig/templates/config.mk.j2
@@ -38,6 +38,9 @@
 {% if prep_headnode_prereqs is defined %}
 PREP_HEADNODE_PREREQS   = $(M)/{{ prep_headnode_prereqs | join(" $(M)/") }}
 {% endif %}
+{% if docker_images_prereqs is defined %}
+DOCKER_IMAGES_PREREQS   = $(M)/{{ docker_images_prereqs | join(" $(M)/") }}
+{% endif %}
 {% if start_xos_prereqs is defined %}
 START_XOS_PREREQS       = $(M)/{{ start_xos_prereqs | join(" $(M)/") }}
 {% endif %}
diff --git a/ansible/roles/genconfig/templates/inventory.ini.j2 b/ansible/roles/genconfig/templates/inventory.ini.j2
index f23f475..74cf4ac 100644
--- a/ansible/roles/genconfig/templates/inventory.ini.j2
+++ b/ansible/roles/genconfig/templates/inventory.ini.j2
@@ -6,6 +6,7 @@
 {% if inventory_groups[groupname] %}
 {% for g_key, g_val in inventory_groups[groupname].iteritems() %}
 {{ g_key }}{% if g_val %} {% for key, val in g_val.iteritems() %}{{ key ~ "=" ~ val }}{% endfor %}{% endif %}
+
 {% endfor %}
 {% endif %}
 {% endmacro %}