Facts are strings so make this explicit

This patch fixes the following ansible warning:

[WARNING]: The value True (type bool) in a string field was converted to
u'True' (type string). If this does not look like what you expect, quote the
entire value to ensure it does not change.

Change-Id: I06cee8173aaf79c2a1bd288fa1a813117ab2b319

tasks/python_venv_set_facts.yml

@@ -23,7 +23,7 @@
     dest: "/etc/ansible/facts.d/{{ venv_facts_dest }}.fact"
     section: "{{ item.section }}"
     option: "{{ item.option }}"
-    value: "{{ item.value }}"
+    value: "{{ item.value | string }}"
   with_items: "{{ venv_facts_when_changed }}"
   when:
     - venv_facts_when_changed != []