Fedora CoreOS support (#5657)

* fedora coreos support
- bootstrap and new fact for

* fedora coreos support
- fix bootstrap condition

* fedora coreos support
- allow customize packages for fedora coreos bootstrap

* fedora coreos support
- prevent install ptyhon3 and epel via dnf for fedora coreos

* fedora coreos support
- handle all ostree like os in same way

* fedora coreos support
- handle all ostree like os in same way for crio

* fedora coreos support
- add fcos documentations

roles/container-engine/docker/tasks/pre-upgrade.yml

@@ -5,7 +5,7 @@
     state: absent
   when:
     - ansible_distribution in ["CentOS","RedHat","OracleLinux"]
-    - not is_atomic
+    - not is_ostree
 
 - name: Ensure old versions of Docker are not installed. | Debian
   apt:
@@ -22,4 +22,4 @@
   when:
     - ansible_os_family == 'RedHat'
     - (docker_versioned_pkg[docker_version | string] is search('docker-ce'))
-    - not is_atomic
+    - not is_ostree