Remove hardcoded ansible.cfg in tox

It is possible users want to use their own ansible.cfg file. Now we
default to what ever ansible-playbook can find. Also update our pre.yaml
file to install ansible.cfg into the home directory of the zuul user.

Change-Id: I354078caed5bee8954a7c21ebef98c8a540f6778
Signed-off-by: Paul Belanger <pabelanger@redhat.com>

tests/playbooks/pre.yaml

@@ -23,6 +23,12 @@
         chdir: "{{ windmill_src_dir }}"
       command: tox -evenv --notest
 
+    - name: Install ansible configuration file
+      copy:
+        dest: "{{ ansible_user_dir }}/.ansible.cfg"
+        remote_src: True
+        src: "{{ ansible_user_dir }}/{{ windmill_src_dir }}/tests/ansible.cfg"
+
     - name: Install ansible roles via galaxy
       args:
         chdir: "{{ windmill_src_dir }}"

tox.ini

@@ -39,7 +39,6 @@ passenv =
   USER
 setenv =
   ANSIBLE_CALLBACK_PLUGINS = {envsitepackagesdir}/ara/plugins/callbacks
-  ANSIBLE_CONFIG = {toxinidir}/tests/ansible.cfg
   PYTHONUNBUFFERED = 1
 
 [flake8]