Allow toggle of host reboots and add defaults

dev/host_vars/dockerbox.yml

@@ -1,4 +1,5 @@
 # base
+allow_reboot: false
 manage_network: false
 network_type: static
 ip_inter: eth1

roles/base/defaults/main.yml

@@ -1 +1,2 @@
-network_type: static
+manage_network: false
+allow_reboot: true

roles/base/handlers/main.yml

@@ -3,3 +3,4 @@
     msg: "Reboot initiated by Ansible"
     connect_timeout: 5
   listen: reboot_host
+  when: allow_reboot