Add Ansible executor class for node context

import the AnsibleCommon class to execute Ansible playbooks

Update node context support to use AnsibleCommon

needs unittests

We must call ansible-playbook as an executable, so we must create temp
files for inventory, and for the playbooks.

AnsibleCommon has evolved to be quite flexible, it auto-generates the
inventory from the context['nodes'] and generates groups from the node
Role.

We also support either a single playbook filename, or a list of
filenames.

If given a list we dynamically generate a playbook that includes the
other playbooks.

We support adding any number of extra_vars using a temp JSON file.

Also designed to be extended by subclassing.

Change-Id: I5bd0a2b4547feaadd70b7e2b8801f19371b99df0
Signed-off-by: Ross Brattain <ross.b.brattain@intel.com>

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