Update the config_template plugin for ansible2

Update the config_template plugin for ansible2

This change updates the config_template plugin to load
the version of the config_template needed based on the
detected version of ansible running. Note, Once the
upstream change merges for ansible 2 [0] we should
drop the ansible 2  version of this plugin.

[0] - https://github.com/ansible/ansible/pull/12555

Change-Id: Ifbdde0f30ee2bd8025ede07c86234527ba9891db
Signed-off-by: Kevin Carter <kevin.carter@rackspace.com>