tests: run k8s-file-volume on a given node

This test can give false-positive on a multi-node cluster. Changed it to
use the new get_one_kata_node() and the modified exec_host() to run the
setup commands on a given node (that has kata installed) and ensure the
test pod is scheduled at that same node.

Fixes #7619
Signed-off-by: Wainer dos Santos Moschetta <wainersm@redhat.com>

tests/integration/kubernetes/k8s-file-volume.bats

@@ -14,7 +14,8 @@ setup() {
 	[ "${KATA_HYPERVISOR}" == "fc" ] && skip "test not working see: ${fc_limitations}"
 	pod_name="test-file-volume"
 	container_name="busybox-file-volume-container"
-	tmp_file=$(exec_host mktemp /tmp/file-volume-test-foo.XXXXX)
+	node="$(get_one_kata_node)"
+	tmp_file=$(exec_host "$node" mktemp /tmp/file-volume-test-foo.XXXXX)
 	mount_path="/tmp/foo.txt"
 	file_body="test"
 	get_pod_config_dir
@@ -22,11 +23,12 @@ setup() {
 
 @test "Test readonly volume for pods" {
 	# Write test body to temp file
-	exec_host "echo "$file_body" > $tmp_file"
+	exec_host "$node" "echo "$file_body" > $tmp_file"
 
 	# Create test yaml
 	sed -e "s|HOST_FILE|$tmp_file|" ${pod_config_dir}/pod-file-volume.yaml > ${pod_config_dir}/test-pod-file-volume.yaml
 	sed -i "s|MOUNT_PATH|$mount_path|" ${pod_config_dir}/test-pod-file-volume.yaml
+	sed -i "s|NODE|$node|" ${pod_config_dir}/test-pod-file-volume.yaml
 
 	# Create pod
 	kubectl create -f "${pod_config_dir}/test-pod-file-volume.yaml"
@@ -43,6 +45,6 @@ teardown() {
 	[ "${KATA_HYPERVISOR}" == "firecracker" ] && skip "test not working see: ${fc_limitations}"
 	[ "${KATA_HYPERVISOR}" == "fc" ] && skip "test not working see: ${fc_limitations}"
 	kubectl delete pod "$pod_name"
-	exec_host rm -f $tmp_file
+	exec_host "$node" rm -f $tmp_file
 	rm -f ${pod_config_dir}/test-pod-file-volume.yaml.yaml
 }

tests/integration/kubernetes/runtimeclass_workloads/pod-file-volume.yaml

@@ -11,6 +11,7 @@ spec:
   terminationGracePeriodSeconds: 0
   runtimeClassName: kata
   restartPolicy: Never
+  nodeName: NODE
   volumes:
   - name: shared-file
     hostPath: