Replaced ansible_ssh_host with ansible_host in sample inventory file as the former is deprecated since Ansible v2.0

Fixed the reference of ansible_user in kubespray-defaults role

References:
 - http://docs.ansible.com/ansible/latest/intro_inventory.html

inventory/sample/hosts.ini

@@ -1,14 +1,14 @@
 # ## Configure 'ip' variable to bind kubernetes services on a
 # ## different ip than the default iface
-# node1 ansible_ssh_host=95.54.0.12  # ip=10.3.0.1
-# node2 ansible_ssh_host=95.54.0.13  # ip=10.3.0.2
-# node3 ansible_ssh_host=95.54.0.14  # ip=10.3.0.3
-# node4 ansible_ssh_host=95.54.0.15  # ip=10.3.0.4
-# node5 ansible_ssh_host=95.54.0.16  # ip=10.3.0.5
-# node6 ansible_ssh_host=95.54.0.17  # ip=10.3.0.6
+# node1 ansible_host=95.54.0.12  # ip=10.3.0.1
+# node2 ansible_host=95.54.0.13  # ip=10.3.0.2
+# node3 ansible_host=95.54.0.14  # ip=10.3.0.3
+# node4 ansible_host=95.54.0.15  # ip=10.3.0.4
+# node5 ansible_host=95.54.0.16  # ip=10.3.0.5
+# node6 ansible_host=95.54.0.17  # ip=10.3.0.6
 
 # ## configure a bastion host if your nodes are not directly reachable
-# bastion ansible_ssh_host=x.x.x.x
+# bastion ansible_host=x.x.x.x ansible_user=some_user
 
 # [kube-master]
 # node1

roles/kubespray-defaults/defaults/main.yaml

@@ -5,7 +5,7 @@ bootstrap_os: none
 
 # Use proxycommand if bastion host is in group all
 # This change obseletes editing ansible.cfg file depending on bastion existance
-ansible_ssh_common_args: "{% if 'bastion' in groups['all'] %} -o ProxyCommand='ssh -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no -W %h:%p {{ ansible_user }}@{{hostvars['bastion']['ansible_host']}} {% if ansible_ssh_private_key_file is defined %}-i {{ ansible_ssh_private_key_file }}{% endif %} ' {% endif %}"
+ansible_ssh_common_args: "{% if 'bastion' in groups['all'] %} -o ProxyCommand='ssh -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no -W %h:%p {{ hostvars['bastion']['ansible_user'] }}@{{ hostvars['bastion']['ansible_host'] }} {% if ansible_ssh_private_key_file is defined %}-i {{ ansible_ssh_private_key_file }}{% endif %} ' {% endif %}"
 
 kube_api_anonymous_auth: false