Sync config_template with upstream for Ansible 2.6

Sync config_template with upstream for Ansible 2.6

The original_basename option in the copy module changed to be
_original_basename in Ansible 2.6+, this PR resyncs the config_template
module to allow this to work with both Ansible 2.6+ and before.

Additionally, this PR removes the _v1_config_template.py file, since
ceph-ansible no longer supports versions of Ansible before version 2,
and so we shouldn't continue to carry that code.

Closes: #2843
Signed-off-by: Andy McCrae <andy.mccrae@gmail.com>