Fix ci-containerd-build-1-3 and ci-containerd-build-1-2 to work with go 1.16
Fix ci-containerd-build-1-3 and ci-containerd-build-1-2 to work with go 1.16

https://testgrid.k8s.io/sig-node-containerd#containerd-build-1.2
and https://testgrid.k8s.io/sig-node-containerd#containerd-build-1.3

show issues because go modules are switched on by default now as the
kubekins image is now at 1.16, so let's switch it off

Signed-off-by: Davanum Srinivas <36003aec7ba325a16727bc9a176c12d2776a8ce4@gmail.com>

dims/test-infra,cblecker/test-infra,monopole/test-infra,kubernetes/test-infra,kubernetes/test-infra,cjwagner/test-infra,cblecker/test-infra,fejta/test-infra,kubernetes/test-infra,michelle192837/test-infra,cjwagner/test-infra,fejta/test-infra,michelle192837/test-infra,michelle192837/test-infra,cblecker/test-infra,cblecker/test-infra,fejta/test-infra,dims/test-infra,cblecker/test-infra,monopole/test-infra,kubernetes/test-infra,BenTheElder/test-infra,fejta/test-infra,michelle192837/test-infra,kubernetes/test-infra,cjwagner/test-infra,dims/test-infra,dims/test-infra,BenTheElder/test-infra,cjwagner/test-infra,monopole/test-infra,fejta/test-infra,cjwagner/test-infra,jessfraz/test-infra,jessfraz/test-infra,BenTheElder/test-infra,jessfraz/test-infra,monopole/test-infra,pwittrock/test-infra,dims/test-infra,BenTheElder/test-infra,jessfraz/test-infra,dims/test-infra,BenTheElder/test-infra,kubernetes/test-infra,pwittrock/test-infra,pwittrock/test-infra,michelle192837/test-infra,jessfraz/test-infra,cblecker/test-infra,cjwagner/test-infra,pwittrock/test-infra,jessfraz/test-infra,michelle192837/test-infra,BenTheElder/test-infra,fejta/test-infra,pwittrock/test-infra,monopole/test-infra,monopole/test-infra