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: Ib7e0d248ca50198ed3d3b5623feafdad26f5df63

examples/playbook.yml

@@ -3,4 +3,4 @@
   user: root
   roles:
     - role: "pip_install"
-      pip_lock_to_internal_repo: True
+      pip_lock_to_internal_repo: True

tasks/install_online.yml

@@ -41,4 +41,4 @@
   tags:
     - pip-install-script
 
-- include: install_source.yml
+- include: install_source.yml

tasks/main.yml

@@ -34,4 +34,4 @@
 
 - include: install.yml
   tags:
-    - pip-install
+    - pip-install

tasks/pre_install.yml

@@ -21,7 +21,7 @@
   until: install_packages|success
   retries: 5
   delay: 2
-  with_items: "{{ python_packages }}"
+  with_items: "{{ pip_install_distro_packages }}"
   when:
     - ansible_pkg_mgr == 'yum'
 
@@ -50,6 +50,6 @@
   until: install_packages|success
   retries: 5
   delay: 2
-  with_items: "{{ python_packages }}"
+  with_items: "{{ pip_install_distro_packages }}"
   when:
     - ansible_pkg_mgr == 'apt'

vars/redhat.yml

@@ -13,7 +13,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-python_packages:
+pip_install_distro_packages:
   - gcc
   - libffi-devel
   - openssl-devel

vars/ubuntu-14.04.yml

@@ -13,7 +13,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-python_packages:
+pip_install_distro_packages:
   - build-essential
   - python-setuptools
   - libffi-dev

vars/ubuntu-16.04.yml

@@ -13,7 +13,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-python_packages:
+pip_install_distro_packages:
   - build-essential
   - python-dev
   - python-setuptools