Drop task that deletes old UCA repo

The variable `uca_apt_source_list_filename` is not defined anywhere
in openstack-ansible so this task is redundant.

Change-Id: I15cc331ad5ec11507860bf61b0c2b20fa8c0b2a0

tasks/openstack_hosts_configure_apt.yml

@@ -50,11 +50,6 @@
   retries: 5
   delay: 2
 
-- name: Remove any old UCA repository using the old filename
-  file:
-    path: "{{ uca_apt_source_list_filename | default('ubuntu_cloud_archive_canonical_com_ubuntu') }}"
-    state: absent
-
 # When updating the cache in the apt_repository
 # task, and the update fails, a retry does not
 # detect a change the second attempt and therefore