Add REQUESTS_CA_BUNDLE to kolla-toolbox container

This patch adds REQUESTS_CA_BUNDLE as it's described
in requests documentation [1].

This is needed because some ansible modules inside uses
python request library and some users of course using
their own CAs.

[1] https://requests.readthedocs.io/en/latest/user/advanced/#ssl-cert-verification

Closes-Bug: #1967132

Change-Id: I901c2bc8ac477f15d2833e68566b19e437f4b6d1

ansible/roles/common/defaults/main.yml

@@ -17,6 +17,7 @@ common_services:
     environment:
       ANSIBLE_NOCOLOR: "1"
       ANSIBLE_LIBRARY: "/usr/share/ansible"
+      REQUESTS_CA_BUNDLE: "{{ openstack_cacert }}"
     privileged: True
     volumes: "{{ kolla_toolbox_default_volumes + kolla_toolbox_extra_volumes + lookup('vars', 'run_default_volumes_' + kolla_container_engine) }}"
     dimensions: "{{ kolla_toolbox_dimensions }}"

releasenotes/notes/bug-923105-d451a78930973a82.yaml

@@ -0,0 +1,7 @@
+---
+fixes:
+  - |
+    Fixes the Python requests library issue when using custom
+    CA by adding the REQUESTS_CA environment variable to the
+    kolla-toolbox container.
+    See `LP#1967132 <https://launchpad.net/bugs/1967132>`__