Update task about selinux set.

1.Fix the invalid value about selinux policy
2.Update description of task about selinux.The permissive mode
need enable selinux.The parameter named "disable_selinux" is not good.
In order to customize selinux modes, we need a new
parameter named "selinux_state".

Closes-Bug: #1749046
Change-Id: I20c084cf2e46cc0de149afbd34c6dcb77a1051f4

ansible/roles/baremetal/defaults/main.yml

@@ -12,7 +12,9 @@ create_kolla_user: True
 
 enable_host_ntp: True
 
-disable_selinux: True
+change_selinux: True
+
+selinux_state: "permissive"
 
 docker_storage_driver: ""
 

ansible/roles/baremetal/tasks/post-install.yml

@@ -115,13 +115,13 @@
     - ansible_os_family == "RedHat"
     - enable_host_ntp | bool
 
-- name: Disable selinux
+- name: Change state of selinux
   selinux:
-    policy: target
-    state: permissive
+    policy: targeted
+    state: "{{ selinux_state }}"
   become: true
   when:
-    - disable_selinux | bool
+    - change_selinux | bool
     - ansible_os_family == "RedHat"
 
 - name: Reboot

releasenotes/notes/add-state-for-selinux-3ab41a8d1c3b099e.yaml

+---
+features:
+  - |
+    Add a new parameter for changing selinux state. The default value is
+    "permissive". Update a parameter named "disable_selinux", use
+    "change_selinux" instead of it.