osd: Fix number of OSD calculation

If some OSDs are to be created and others already exist the calculation
only counted the to be created OSDs. This changes the calculation to
take all OSDs into account.
Signed-off-by: Gaudenz Steinlin <gaudenz.steinlin@cloudscale.ch>
(cherry picked from commit 15044da0)

roles/ceph-config/tasks/main.yml

@@ -80,14 +80,12 @@
     changed_when: false
     when:
       - devices | default([]) | length > 0
-      - not (lvm_batch_report.stdout | default('{}') | from_json).changed | default(false) | bool
 
-  - name: set_fact num_osds from the output of 'ceph-volume lvm list'
+  - name: set_fact num_osds (add existing osds)
     set_fact:
-      num_osds: "{{ lvm_list.stdout | default('{}') | from_json | length | int }}"
+      num_osds: "{{ lvm_list.stdout | default('{}') | from_json | length | int + num_osds | default(0) | int }}"
     when:
       - devices | default([]) | length > 0
-      - not (lvm_batch_report.stdout | default('{}') | from_json).changed | default(false) | bool
 
 - name: create ceph conf directory
   file: