Take Ansible integration tests out, write and use our own

This removes the ara.sh and ansible.sh helper scripts to run
integration tests and instead builds on top of the self-contained
integration tests we had with ara.sh.

The goal of the exercise is to test a small amount of things to
ensure ARA features are not very broken:
- More than one playbook
- More than one play
- More than one task
- More than one host
- Host facts
- Tasks in playbook
- Tasks in roles
- Different task statuses (skipped, changed, and so on)
- etc.

Change-Id: I20bce83e4fc3752e2d894014f16be4aeb5fa1da8

tox.ini

@@ -4,7 +4,7 @@ envlist = py27,pep8
 skipdist = True
 
 [testenv]
-sitepackages=False
+sitepackages=True
 usedevelop = True
 install_command = pip install -U {opts} {packages}
 setenv = VIRTUAL_ENV={envdir}