Disable log dump
It avoids dumping logs at the end which requires gcloud configured (CI).
Then it partially reverts "Keep kubernetes sources" [1].
It now dumps e2e.test output in e2e.log as sonobuoy [2].
[1] https://gerrit.opnfv.org/gerrit/68106
[2] https://raw.githubusercontent.com/cncf/k8s-conformance/master/v1.15/kubeadm/e2e.log
Change-Id: I400e1cf92a8540eba3d40db1ed4237628921efe6
Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>
(cherry picked from commit
d1d3feacdbf061cf4115ceeadcb71d2142971757)