When running CI tests, test performance can be improved by creating a
snapshot image to use for the test, pre-installed with packages used by
the role tests. The CI system can use tests/setup-snapshot.yml to
prepare the snapshot image. Rather than having a list of packages to
install in multiple places, the code which ensures the facts and
variables is moved to a separate tasks/set_facts.yml so that the setup
playbook can use `tasks_from: set_facts.yml` to get the list of network
packages to install. NOTE: The network role developers should add
additional packages to setup-snapshot.yml for other packages installed
by other tests.
Signed-off-by: Rich Megginson <rmeggins@redhat.com>
