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gem5 dropped the support for python2. This change sets python3 to have a higher priority than python2 in the Ubuntu 18.04 docker images. This is done so that gem5 will be compiled and tested in the python3 environment by default. JIRA: https://gem5.atlassian.net/browse/GEM5-958 Signed-off-by: Hoa Nguyen <hoanguyen@ucdavis.edu> Change-Id: I11ffb06697ecf4cebf9f98b611641faa42805547 Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/45125 Maintainer: Bobby R. Bruce <bbruce@ucdavis.edu> Maintainer: Jason Lowe-Power <power.jg@gmail.com> Reviewed-by: Jason Lowe-Power <power.jg@gmail.com> Tested-by: kokoro <noreply+kokoro@google.com> Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/45826 Reviewed-by: Gabe Black <gabe.black@gmail.com> Maintainer: Gabe Black <gabe.black@gmail.com>