Rename package lists (and related vars) appropriately

In order to make it easier to differentiate between the lists of
python packages, distribution packages, downloaded packages,
package pins and other similar variables the variable names are
being changed to ensure that they have a more explicit suffix
that defines the purpose and makes the naming more consistent.

This is to facilitate a lookup plugin which will be able to look
up all the package lists and present them as a consolidated piece
of data which may be used for artifact preparation.

Change-Id: If3816d9c79ecd1a61a3a53fed95828bff6d91181

releasenotes/notes/package-var-rename-6ec3af6242073a2e.yaml

@@ -0,0 +1,4 @@
+---
+upgrade:
+  - The variable ``rsyslog_client_packages`` has been replaced
+    by ``rsyslog_client_distro_packages``.

tasks/rsyslog_client_install-apt.yml

@@ -34,4 +34,4 @@
   until: install_packages|success
   retries: 5
   delay: 2
-  with_items: "{{ rsyslog_client_packages }}"
+  with_items: "{{ rsyslog_client_distro_packages }}"

tasks/rsyslog_client_install-yum.yml

@@ -21,4 +21,4 @@
   until: install_packages|success
   retries: 5
   delay: 2
-  with_items: "{{ rsyslog_client_packages }}"
+  with_items: "{{ rsyslog_client_distro_packages }}"

vars/debian.yml

@@ -17,6 +17,6 @@
 # rsyslog_client_repos:
 #   - { repo: "ppa:adiscon/v8-stable", state: "present" }
 
-rsyslog_client_packages:
+rsyslog_client_distro_packages:
   - rsyslog
   - logrotate

vars/redhat-7.yml

@@ -13,6 +13,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-rsyslog_client_packages:
+rsyslog_client_distro_packages:
   - rsyslog
   - logrotate