Remove podspec-volumes-emptydir toggle (#358)

Co-authored-by: Kenjiro Nakayama <nakayamakenjiro@gmail.com>

openshift/e2e-common.sh

@@ -217,14 +217,11 @@ function run_e2e_tests(){
   enable_feature_flags secure-pod-defaults || fail_test
 
   if [ -n "$test_name" ]; then
-    enable_feature_flags kubernetes.podspec-volumes-emptydir || fail_test
     go_test_e2e -tags=e2e -timeout=15m -parallel=1 \
     ./test/e2e ./test/conformance/api/... ./test/conformance/runtime/... \
     -run "^(${test_name})$" \
     --imagetemplate "$TEST_IMAGE_TEMPLATE" \
     ${OPENSHIFT_TEST_OPTIONS} || failed=$?
-    disable_feature_flags kubernetes.podspec-volumes-emptydir || fail_test
-
     return $failed
   fi
 
@@ -236,12 +233,10 @@ function run_e2e_tests(){
     parallel=2
   fi
 
-  enable_feature_flags kubernetes.podspec-volumes-emptydir || fail_test
   go_test_e2e -tags=e2e -timeout=30m -parallel=$parallel \
     ./test/e2e ./test/conformance/api/... ./test/conformance/runtime/... \
     --imagetemplate "$TEST_IMAGE_TEMPLATE" \
     ${OPENSHIFT_TEST_OPTIONS} || failed=1
-  disable_feature_flags kubernetes.podspec-volumes-emptydir || fail_test
 
  enable_feature_flags tag-header-based-routing || fail_test
  go_test_e2e -timeout=2m ./test/e2e/tagheader \
@@ -271,11 +266,11 @@ function run_e2e_tests(){
     ${OPENSHIFT_TEST_OPTIONS} || failed=1
 
   # Run init-containers test
-  enable_feature_flags kubernetes.podspec-volumes-emptydir kubernetes.podspec-init-containers || fail_test
+  enable_feature_flags kubernetes.podspec-init-containers || fail_test
   go_test_e2e -timeout=2m ./test/e2e/initcontainers \
     --imagetemplate "$TEST_IMAGE_TEMPLATE" \
     ${OPENSHIFT_TEST_OPTIONS} || failed=1
-  disable_feature_flags kubernetes.podspec-volumes-emptydir kubernetes.podspec-init-containers || fail_test
+  disable_feature_flags kubernetes.podspec-init-containers || fail_test
 
   # Run PVC test
   enable_feature_flags kubernetes.podspec-persistent-volume-claim kubernetes.podspec-persistent-volume-write kubernetes.podspec-securitycontext || fail_test