Fix failing role on non-SELinux RedHat (#37)

[patch] Allow playbook to run on RedHat even if SELinux is not enabled.

Author: noraab

tasks/main.yml

@@ -91,8 +91,8 @@
     setype: http_port_t
     state: present
   when:
-    - ansible_os_family == "RedHat"
-    - ansible_virtualization_type != "docker"
+    - ansible_version.full is version_compare('2.4', '>=')
+    - ansible_selinux.status == "enabled"
 
 - name: Ensure Node Exporter is enabled on boot
   systemd: