Update get-pip to version 3.3

Version 3.2 has a bug with it on some systems that can result in the
following stacktrace: [ http://paste.openstack.org/show/726064 ]. To
correct this issue the version of the get-pip script has been set to 3.3
which does not suffer from the same issue.

Change-Id: Iaddb390a13d1955356e85af11ab087319808697c
Closes-Bug: #1779534

tasks/repo_build_wheels.yml

@@ -128,7 +128,7 @@
 
 - name: Get /opt/get-pip.py if it does not exist
   get_url:
-    url: "{{ pip_upstream_url | default('https://bootstrap.pypa.io/3.2/get-pip.py') }}"
+    url: "{{ pip_upstream_url | default('https://bootstrap.pypa.io/3.3/get-pip.py') }}"
     dest: "/opt/get-pip.py"
     force: no
   register: _get_pip