489d13fc17
DevStack provides get_extra_file[1] to download node_exporter/prometheus tarballs and cache them in ci for further use. Let's reuse the same instead of wget the binary. This CR also adds cleanup phase under unstack step. Links: [1]. https://github.com/openstack/devstack/blob/master/functions#L50-L79 Closes-Bug: #2102666 Change-Id: I858eea3584794fdc10e45c9f80bfacdabdd537e2 Signed-off-by: Chandan Kumar (raukadah) <chkumar@redhat.com>