Increase reboot wait timeout in disable-selinux for non-virt hosts

Default of 300s was proving too short for real machines, increase to
600s.

ansible/disable-selinux.yml

@@ -3,3 +3,4 @@
   hosts: controllers:seed
   roles:
     - role: disable-selinux
+      disable_selinux_reboot_timeout: "{{ 600 if ansible_virtualization_role == 'host' else 300 }}"

ansible/roles/disable-selinux/defaults/main.yml

@@ -0,0 +1,4 @@
+---
+# Number of seconds to wait for hosts to become accessible via SSH after being
+# rebooted.
+disable_selinux_reboot_timeout:

ansible/roles/disable-selinux/tasks/main.yml

@@ -51,6 +51,7 @@
     state: started
     # Wait for 10 seconds before polling to ensure the node has shutdown.
     delay: 10
+    timeout: "{{ disable_selinux_reboot_timeout }}"
   when:
     - "{{ selinux_result | changed }}"
     - "{{ not is_local | bool }}"