Changre raw execution to use yum module (#1785)

* Changre raw execution to use yum module

Changed raw exection to use yum module provided by Ansible.

* Replace ansible_ssh_* by ansible_*

Ansible 2.0 has deprecated the “ssh” from ansible_ssh_user, ansible_ssh_host, and ansible_ssh_port to become ansible_user, ansible_host, and ansible_port. If you are using a version of Ansible prior to 2.0, you should continue using the older style variables (ansible_ssh_*). These shorter variables are ignored, without warning, in older versions of Ansible.

I am not sure about the broader impact of this change. But I have seen on the requirements the version required is ansible>=2.4.0.

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

roles/bootstrap-os/tasks/bootstrap-centos.yml

@@ -15,4 +15,6 @@
   when: fastestmirror.stat.exists
 
 - name: Install packages requirements for bootstrap
-  raw: yum -y install libselinux-python
+  yum:
+    name: libselinux-python
+    state: present