Pull correct variable for etcd initial variable

This shouldn't use the `inventory_hostname` variable, as that will just yield the same variable, but rather use the `host` which we're looping over.

roles/etcd/templates/etcd.j2

@@ -13,5 +13,5 @@ ETCD_INITIAL_CLUSTER_TOKEN="k8s_etcd"
 ETCD_LISTEN_PEER_URLS="http://{{ hostvars[inventory_hostname]['ip'] | default( hostvars[inventory_hostname]['ansible_default_ipv4']['address'])  }}:2380"
 ETCD_NAME="{{ etcd.name }}"
 {% endif %}
-ETCD_INITIAL_CLUSTER="{% for host in groups['etcd'] %}etcd{{ loop.index|string }}=http://{{ hostvars[host]['access_ip'] | default(hostvars[host]['ip'] | default(hostvars[inventory_hostname]['ansible_default_ipv4']['address'])) }}:2380{% if not loop.last %},{% endif %}{% endfor %}"
+ETCD_INITIAL_CLUSTER="{% for host in groups['etcd'] %}etcd{{ loop.index|string }}=http://{{ hostvars[host]['access_ip'] | default(hostvars[host]['ip'] | default(hostvars[host]['ansible_default_ipv4']['address'])) }}:2380{% if not loop.last %},{% endif %}{% endfor %}"
 ETCD_LISTEN_CLIENT_URLS="http://{{ hostvars[inventory_hostname]['ip'] | default( hostvars[inventory_hostname]['ansible_default_ipv4']['address'])  }}:2379,http://127.0.0.1:2379"