
Allow overriding the dry-run temporary directory with an env. variable (KUBEADM_INIT_DRYRUN_DIR). Use the same variable in test/cmd/init_test.go. This allows running integration tests as non-root.
Allow overriding the dry-run temporary directory with an env. variable (KUBEADM_INIT_DRYRUN_DIR). Use the same variable in test/cmd/init_test.go. This allows running integration tests as non-root.