Move UCA repo URL var to role defaults

In order to expose the var in role documentation and to allow the use
of dynamically set facts to override the value in CI environments the
variable is moved from the role vars to the role defaults.

The uca_openstack_release var is also changed for Ubuntu 16.04 to
'newton' in order to match the current cycle appropriately. A note is
added to the Ubuntu 14.04 vars to make it clear that there will never
be a Newton UCA release for Trusty.

A small correction to the task description which sets the URL for the
AIO build in OpenStack-CI is also made to be more accurate.

Change-Id: I35b8e99e6e3f127ca507907d6480542b91a4107d

defaults/main.yml

@@ -38,9 +38,12 @@
 #            unlike the other options does not attempt to manage package keys or add additional
 #            package repositories.
 ceph_pkg_source: ceph
-
 ceph_apt_pinned_packages: [{ package: "*", release: Inktank,  priority: 1001 }]
 
+# Ubuntu Cloud Archive mirror URL
+# This is only used if 'uca' is the selected option for ceph_pkg_source
+uca_apt_repo_url: "http://ubuntu-cloud.archive.canonical.com/ubuntu"
+
 # Ceph Authentication
 cephx: true
 
@@ -63,19 +66,26 @@ ceph_mons: []
 glance_ceph_client: glance
 cinder_ceph_client: cinder
 cinder_backup_ceph_client: cinder-backup
+
 # by default we assume you use rbd for both cinder and nova, and as libvirt
 # needs to access both volumes (cinder) as boot disks (nova) we default to
 # reuse the cinder_ceph_client
 # only need to change this if you'd use ceph for boot disks and not for volumes
 nova_ceph_client: '{{ cinder_ceph_client }}'
+
 # overruled in user_secrets:
+# TODO(odyssey4me) - the uuid should be removed, there should be no defaults for secrets
 nova_ceph_client_uuid: 457eb676-33da-42ec-9a8c-9293d545c337
 cephkeys_access_group: cephkeys
+
 openstack_service_system_user: null
+
 ceph_cinder_service_names:
   - cinder-volume
   - cinder-backup
+
 ceph_nova_service_names:
   - nova-compute
+
 ceph_glance_service_names:
   - glance-api

vars/ubuntu-14.04.yml

@@ -35,8 +35,9 @@ ceph_stable_release: hammer
 ceph_apt_repo_url: "http://{{ ceph_apt_repo_url_region }}.ceph.com/debian-{{ ceph_stable_release }}/"
 
 # Ubuntu Cloud Archive variables
+# There are no UCA packages for Trusty beyond Mitaka, so the selected
+# release here has to remain at Mitaka.
 uca_openstack_release: mitaka
-uca_apt_repo_url: "http://ubuntu-cloud.archive.canonical.com/ubuntu"
 uca_repo_dist: "{{ ansible_lsb.codename }}-updates/{{ uca_openstack_release }}"
 
 # Apt repositories

vars/ubuntu-16.04.yml

@@ -35,9 +35,7 @@ ceph_stable_release: hammer
 ceph_apt_repo_url: "http://{{ ceph_apt_repo_url_region }}.ceph.com/debian-{{ ceph_stable_release }}/"
 
 # Ubuntu Cloud Archive variables
-# TODO(smatzek) Revisit the default uca release for 16.04 at newton-1
-uca_openstack_release: mitaka
-uca_apt_repo_url: "http://ubuntu-cloud.archive.canonical.com/ubuntu"
+uca_openstack_release: newton
 uca_repo_dist: "{{ ansible_lsb.codename }}-updates/{{ uca_openstack_release }}"
 
 # Apt repositories