Make Ceph upgrade check Ceph release to avoid EPERM

Since we have different upgrade paths, we must use the actually
installed Ceph release name when doing require-osd-release

Closes-Bug: #1832989

Change-Id: I6aaa4b4ac0fb739f7ad885c13f55b6db969996a2
Signed-off-by: Radosław Piliszek <radoslaw.piliszek@gmail.com>

ansible/roles/ceph/tasks/upgrade.yml

@@ -35,11 +35,17 @@
     - enable_ceph_nfs | bool
     - inventory_hostname in groups['ceph-nfs']
 
-# NOTE(chenxing): Disallowing pre-luminous OSDs and enabling all
+- name: Check final release (as running on MONs)
-# new Luminous-only functionality
-- name: Enabling all new Luminous-only functionality
   become: true
-  command: docker exec ceph_mon ceph osd require-osd-release luminous
+  shell: docker exec ceph_mon ceph version | cut -d' ' -f5
+  changed_when: false
+  register: ceph_release_command
   delegate_to: "{{ groups['ceph-mon'][0] }}"
-  changed_when: False
+  run_once: true
-  run_once: True
+
+- name: Finalize the upgrade by disallowing older OSDs
+  become: true
+  command: docker exec ceph_mon ceph osd require-osd-release {{ ceph_release_command.stdout }}
+  changed_when: false
+  delegate_to: "{{ groups['ceph-mon'][0] }}"
+  run_once: true