Set selinux state to 'permissive' for state=disabled

As discussed in https://groups.google.com/forum/#!topic/ansible-devel/uVGldwJUBUQ

A task `- selinux state=disabled` just configures the configuration file to `disabled`, but leaves the current state of SELinux untouched (which is `enforcing` by default), so this task is basically useless until the reboot. This pull request besides disabling SELinux in the config file sets it to `permissive`, so that we can finish a playbook without a need of a reboot in the middle.