Remove pip_lock_to_internal_repo variable

This variable is no longer set to true anywhere, so it
is no longer required.

Implements: blueprint python-build-install-simplification
Signed-off-by: Jesse Pretorius <jesse.pretorius@rackspace.co.uk>
Change-Id: I432e90566fd8574c8a1302bafb710bd6cfd0d02d

playbooks/common-tasks/set-pip-upstream-url.yml

@@ -32,7 +32,6 @@
 - name: Set pip upstream URL
   set_fact:
     pip_upstream_url: "https://bootstrap.pypa.io/get-pip.py"
-    pip_lock_to_internal_repo: false
   when:
     - pip_upstream_url != "https://bootstrap.pypa.io/get-pip.py"
     - (_repo_data_check.status | default(503)) != 200

playbooks/common-tasks/set-upper-constraints.yml

@@ -72,7 +72,6 @@
 - name: Fallback to PyPI
   set_fact:
     pip_default_index: "https://pypi.python.org/simple"
-    pip_lock_to_internal_repo: False
   when: (pip_default_index_check.status | default(503)) != 200
   tags:
     - common-constraints