Update tests to work w/ secure_path update

The tests in this role were crafted to work with an upstream image
config that persisted a user's PATH when the user sudos to root.  We
raised this issue with openstack-infra as it was a non-standard config
and difficult to debug. This was reverted in [1] and this commit now
updates the tests to not assume that packages are being installed into
tox's functional venv.

[1] https://review.openstack.org/#/c/296598/

Change-Id: Ibb068f558fcc05c57f291698023459c92cbe12d6

tests/inventory

@@ -1,8 +1,8 @@
 [all]
-localhost ansible_connection=local ansible_become=True ansible_python_interpreter=ENVPYTHON
+localhost ansible_connection=local ansible_become=True
 
 [cinder_volume]
-localhost ansible_connection=local ansible_become=True ansible_python_interpreter=ENVPYTHON
+localhost ansible_connection=local ansible_become=True
 
 [cinder_all]
-localhost ansible_connection=local ansible_become=True ansible_python_interpreter=ENVPYTHON
+localhost ansible_connection=local ansible_become=True

tox.ini

@@ -15,8 +15,6 @@ whitelist_externals =
     bash
     git
     rm
-    ln
-    sed
 setenv =
     VIRTUAL_ENV={envdir}
     ANSIBLE_HOST_KEY_CHECKING = False
@@ -108,17 +106,6 @@ commands =
 [testenv:functional]
 commands =
     rm -rf {homedir}/.ansible
-    # Ansible is run using python in the tox venv, which doesn't have python-apt in it.
-    # Installing python-apt is non-trivial at first glance so for now we just symlink
-    # these in from the host.
-    ln -snf /usr/lib/python2.7/dist-packages/apt/ {envsitepackagesdir}/apt
-    ln -snf /usr/lib/python2.7/dist-packages/aptsources/ {envsitepackagesdir}/aptsources
-    ln -snf /usr/lib/python2.7/dist-packages/apt_pkg.so {envsitepackagesdir}/apt_pkg.so
-    ln -snf /usr/lib/python2.7/dist-packages/apt_inst.so {envsitepackagesdir}/apt_inst.so
-    # This forces Ansible to use the venv interpreter for localhost, which means we don't
-    # run into issues where things are being installed into the venv but then Ansible
-    # complains that it doesn't exist in /usr/local/lib.
-    sed -i 's@ENVPYTHON@{envpython}@g' tests/inventory
     git clone https://git.openstack.org/openstack/openstack-ansible-plugins \
               {homedir}/.ansible/plugins
     ansible-galaxy install \