preflight: generalize repo and key task names

Ansible runs these tasks for both "community" or "ibm". Remove the
references to upstream/community in the task names.

(cherry picked from commit 19ad442)

cephadm-preflight.yml

@@ -50,7 +50,7 @@
           rhsm_repository:
             name: "rhceph-{{ ceph_rhcs_version }}-tools-for-rhel-8-{{ ansible_facts['architecture'] }}-rpms"
 
-    - name: enable repo from download.ceph.com
+    - name: enable ceph package repositories
       when: ceph_origin in ['community', 'ibm']
       block:
         - name: set_fact _ceph_repo
@@ -61,7 +61,7 @@
               rpm_key: "{{ ceph_stable_key if ceph_origin == 'community' else ceph_ibm_key }}"
               baseurl: "{{ ceph_community_repo_baseurl if ceph_origin == 'community' else ceph_ibm_repo_baseurl }}"
 
-        - name: configure ceph community repository stable key
+        - name: configure ceph repository key
           rpm_key:
             key: "{{ _ceph_repo.rpm_key }}"
             state: present