Introduce networking/v1alpha1 api, ClusterCIDR type

Introduce networking/v1alpha1 api group.

Add `ClusterCIDR` type to networking/v1alpha1 api group, this type
will enable the NodeIPAM controller to support multiple ClusterCIDRs.

plugin/pkg/auth/authorizer/rbac/bootstrappolicy/controller_policy.go

@@ -250,6 +250,7 @@ func buildControllerRoles() ([]rbacv1.ClusterRole, []rbacv1.ClusterRoleBinding)
 				// used for pod deletion
 				rbacv1helpers.NewRule("update").Groups(legacyGroup).Resources("pods/status").RuleOrDie(),
 				rbacv1helpers.NewRule("list", "delete").Groups(legacyGroup).Resources("pods").RuleOrDie(),
+				rbacv1helpers.NewRule("get", "list", "create", "update").Groups(networkingGroup).Resources("clustercidrs").RuleOrDie(),
 				eventsRule(),
 			},
 		}

plugin/pkg/auth/authorizer/rbac/bootstrappolicy/testdata/controller-roles.yaml

@@ -907,6 +907,15 @@ items:
     verbs:
     - delete
     - list
+  - apiGroups:
+    - networking.k8s.io
+    resources:
+    - clustercidrs
+    verbs:
+    - create
+    - get
+    - list
+    - update
   - apiGroups:
     - ""
     - events.k8s.io