hakman: Use the "ubuntu" SSH user for pull-kubernetes-e2e-kops-aws (3)

JobBuild
19285
09-19 08:07
pull-test-infra-bazel 1307229659221463040
pull-test-infra-gubernator 1307229659238240256
pull-test-infra-prow-checkconfig 1307229659292766208
pull-test-infra-verify-file-perms 1307229659259211776
pull-test-infra-yamllint 1307229659275988992