Update ubuntu18.04 docker nodes

Update to a newer image to fetch changes by
I8b2c84eafdf8fe17866a2272665ff9396a84e432
(Added Python 3.8 env support).

Issue-ID: CIMAN-33
Signed-off-by: Jessica Wagantall <jwagantall@linuxfoundation.org>
Change-Id: Ie1a840525634d8f027fee2050007efc5ccefb5e9
2 files changed