feat(removal): tox-ansible support

This patch removes the support of tox-ansible from
tripleo-validations. Due to several issues with pip dependencies
management and our requirements files, the installation of this latter
doesn't work.

Change-Id: I6355c888a75ecb32206c4cb5c24e3806ab0a1d73
Signed-off-by: Gael Chamoulaud (Strider) <gchamoul@redhat.com>

tox.ini

@@ -2,8 +2,6 @@
 minversion = 3.2.0
 envlist = linters,docs,py3
 skipsdist = True
-requires =
-    tox-ansible >= 1.4.0
 
 # Automatic envs (pyXX) will only use the python version appropriate to that
 # env and ignore basepython inherited from [testenv] if we set
@@ -179,13 +177,3 @@ commands =
 # Settings for doc8:
 extensions = .rst
 ignore = D001
-
-[ansible]
-description = Used as base for all tox-ansible environments
-scenario_format = $parent-$nondefault_name
-deps =
-  -c {env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
-  -r {toxinidir}/requirements.txt
-  -r {toxinidir}/test-requirements.txt
-molecule_opts =
-    --debug