Add ability to disable implementing pip.conf

On something like the repo server we do not want to
change the default pip settings so that we allow
the global pip.conf or default pip settings to do
the right things.

Change-Id: I7bd31f2d89d3fe9d48e32c79ddef7a8ef1392eb7

defaults/main.yml

@@ -98,6 +98,13 @@ cache_timeout: 600
 # is intercepting the certificates.
 pip_validate_certs: "yes"
 
+# Boolean variable to set whether pip.conf should be
+# implemented to adjust pip's default behaviour.
+# By default we do this, but sometimes we want to
+# just let the default pip.conf on the system or
+# pip's default settings do their thing.
+pip_configure: true
+
 # Options for pip global
 pip_enable_pre_releases: true
 pip_timeout: 120

tasks/main.yml

@@ -25,6 +25,9 @@
     - always
 
 - include: configure.yml
+  static: no
+  when:
+    - pip_configure | bool
   tags:
     - pip_install-install