Change file used to check kubeadm upgrade method (#1784)
Change file used to check kubeadm upgrade method (#1784)

* Change file used to check kubeadm upgrade method

Test for ca.crt instead of admin.conf because admin.conf
is created during normal deployment.

* more fixes for upgrade

kubernetes-incubator/kargo,kubernetes-incubator/kubespray,kubernetes-sigs/kubespray,kubernetes-incubator/kubespray,Abdelsalam-Abbas/kubespray_fork,Atoms/kubespray,sgm-media/kargo,insequent/kargo,kubespray/kargo,Atoms/kubespray,Atoms/kubespray,kubernetes-sigs/kubespray,Abdelsalam-Abbas/kubespray_fork,kubespray/kargo,kubernetes-incubator/kargo,kubernetes-sigs/kubespray,Atoms/kubespray,sgm-media/kargo,kubernetes-sigs/kubespray,insequent/kargo