Starting in Ansible 2.0, the get_url [1] module provides the
ability for a checksum to be provided to the get_url module
which will be verified against the local destination file
and the task skipped if it matches.
[1] http://docs.ansible.com/ansible/get_url_module.html
This patch implements the use of this functionality.
The ability to ignore a venv download failure is also removed
as this is not necessary or desirable. It is better for the
download to fail and the playbook execution to stop immediately
so that the failure point is exposed.
Change-Id: I0e33da0dc601eaa4af06c03a20803fcd01405531
cf1dfcc3bf