Install get-pip.py for python3.5/xenial with specific url

The get-pip script does not work well with python3.5/xenial
It raises error during installation [1].
Use python3.5 specific url to install working version.

[1] https://github.com/pypa/get-pip/issues/83

Change-Id: Iea35d9df1ea5f2b8ea5e5d29b4c79e97c99848a1

playbooks/roles/pip3/tasks/default.yaml

@@ -0,0 +1,5 @@
+- name: Download get-pip.py
+  command: wget https://bootstrap.pypa.io/get-pip.py
+  args:
+    chdir: /var/lib
+    creates: /var/lib/get-pip.py

playbooks/roles/pip3/tasks/main.yaml

@@ -16,11 +16,15 @@
     state: present
   when: ansible_distribution_release != 'xenial'
 
-- name: Download get-pip.py
-  command: wget https://bootstrap.pypa.io/get-pip.py
-  args:
-    chdir: /var/lib
-    creates: /var/lib/get-pip.py
+- name: Download OS/Python specific get-pip.py
+  include_tasks: "{{ get_pip_os }}"
+  with_first_found:
+    - "{{ ansible_distribution_release }}.yaml"
+    - "{{ ansible_distribution }}.yaml"
+    - "{{ ansible_os_family }}.yaml"
+    - "default.yaml"
+  loop_control:
+    loop_var: get_pip_os
 
 - name: Install pip
   command: python3 /var/lib/get-pip.py

playbooks/roles/pip3/tasks/xenial.yaml

@@ -0,0 +1,6 @@
+# https://github.com/pypa/get-pip/issues/83
+- name: Download get-pip.py
+  command: wget https://bootstrap.pypa.io/3.5/get-pip.py
+  args:
+    chdir: /var/lib
+    creates: /var/lib/get-pip.py