navist2020: kubeadm/kubeconfig:validate flag --config to make sure it is not empty

JobBuild
cc2802d9
10-14 03:06
a0e51f57
10-14 01:35
105649
10-13 17:23
246b1993
10-13 17:22
pull-kubernetes-conformance-kind-ga-only-parallel 1448485382264983552 1448462468417327104 1448338262341980160
pull-kubernetes-dependencies 1448485382084628480 1448462467976925184 1448338262182596608
pull-kubernetes-e2e-gce-100-performance 1448485382369841152 1448462468941615104 1448338262442643456
pull-kubernetes-e2e-gce-ubuntu-containerd 1448485382118182912 1448462468048228352 1448338262216151040
pull-kubernetes-e2e-kind 1448485382189486080 1448462468228583424 1448338262279065600
pull-kubernetes-e2e-kind-ipv6 1448485382223040512 1448462468304080896 1448338262308425728
pull-kubernetes-integration 1448485382155931648 1448462468148891648 1448338262245511168
pull-kubernetes-node-e2e-containerd 1448485382332092416 1448462468593487872 1448338262400700416
pull-kubernetes-typecheck 1448485382399201280 1448462469126164480 1448338262472003584
pull-kubernetes-unit 1448528550255661056 1448485382298537984 1448462468505407488 1448338262371340288
pull-kubernetes-verify 1448485383758155776 1448462469629480960 1448338263843540992
pull-kubernetes-verify-govet-levee 1448485382915100672 1448462469176496128 1448338262992097280