Fix error in ETCD_INITIAL_CLUSTER loop

roles/etcd/templates/etcd2-environment.j2

 ETCD_DATA_DIR="/var/lib/etcd2"
 {% if inventory_hostname in groups['etcd'] %}
 {% set etcd = {} %}
-{% for srv in groups['etcd'] %}
-{% if inventory_hostname == srv %}
+{% for host in groups['etcd'] %}
+{% if inventory_hostname == host %}
 {% set _dummy = etcd.update({'name':"master"+loop.index|string}) %}
 {% endif %}
 {% endfor %}
 ETCD_ADVERTISE_CLIENT_URLS="http://{{ hostvars[inventory_hostname]['ip'] | default( ansible_default_ipv4.address) }}:2379"
 ETCD_INITIAL_ADVERTISE_PEER_URLS="http://{{ hostvars[inventory_hostname]['ip'] | default( ansible_default_ipv4.address)  }}:2380"
-ETCD_INITIAL_CLUSTER="{% for srv in groups['etcd'] %}master{{ loop.index|string }}=http://{{ hostvars[inventory_hostname]['ip'] | default( ansible_default_ipv4.address) }}:2380{% if not loop.last %},{% endif %}{% endfor %}"
+ETCD_INITIAL_CLUSTER="{% for host in groups['etcd'] %}master{{ loop.index|string }}=http://{{ hostvars[host]['ip'] | default(hostvars[host]['ansible_default_ipv4']['address']) }}:2380{% if not loop.last %},{% endif %}{% endfor %}"
 ETCD_INITIAL_CLUSTER_STATE="new"
 ETCD_INITIAL_CLUSTER_TOKEN="k8s_etcd"
 ETCD_LISTEN_CLIENT_URLS="http://{{ hostvars[inventory_hostname]['ip'] | default( ansible_default_ipv4.address)  }}:2379,http://127.0.0.1:2379"
 ETCD_LISTEN_PEER_URLS="http://{{ hostvars[inventory_hostname]['ip'] | default( ansible_default_ipv4.address)  }}:2380"
 ETCD_NAME="{{ etcd.name }}"
 {% else  %}
-ETCD_INITIAL_CLUSTER="{% for srv in groups['etcd'] %}master{{ loop.index|string }}=http://{{ srv }}:2380{% if not loop.last %},{% endif %}{% endfor %}"
+ETCD_INITIAL_CLUSTER="{% for host in groups['etcd'] %}master{{ loop.index|string }}=http://{{ host }}:2380{% if not loop.last %},{% endif %}{% endfor %}"
 ETCD_LISTEN_CLIENT_URLS="http://127.0.0.1:23799"
 {% endif %}