Raise exception on KeyboardInterrupt
Raise exception on KeyboardInterrupt

Using subprocess with tenacity can lead to issues when a keyboard
interrupt occurs because the logic we have will actually trigger a
retry. This can lead to the inability to stop some of the commands with
a ctrl+c.

Change-Id: I294910384fc9dd9ca8c7114d08842868909d9e9f
Closes-Bug: #1746724

openstack/tripleo-common,openstack/tripleo-common