Set OS_ENDPOINT_TYPE in keystone openrc vars

sometimes it is needed to use other than `openstack` CLI clients
or older versions of those in bootstrap/other scripts that do not
understand the OS_INTERFACE env var, and instead use the
OS_ENDPOINT_TYPE var (and --os-endpoint-type CLI arg) for the same
purpose.

Example is `neutron` command from python-neutronclient package.

Change-Id: I0fb7d1e9612391e8632d775b91848d3c834b9bd2

helm-toolkit/templates/snippets/_keystone_openrc_env_vars.tpl

@@ -40,6 +40,11 @@ return: |
       secretKeyRef:
         name: example-keystone-admin
         key: OS_INTERFACE
+  - name: OS_ENDPOINT_TYPE
+    valueFrom:
+      secretKeyRef:
+        name: example-keystone-admin
+        key: OS_INTERFACE
   - name: OS_PROJECT_DOMAIN_NAME
     valueFrom:
       secretKeyRef:
@@ -86,6 +91,11 @@ return: |
     secretKeyRef:
       name: {{ $ksUserSecret }}
       key: OS_INTERFACE
+- name: OS_ENDPOINT_TYPE
+  valueFrom:
+    secretKeyRef:
+      name: {{ $ksUserSecret }}
+      key: OS_INTERFACE
 - name: OS_PROJECT_DOMAIN_NAME
   valueFrom:
     secretKeyRef: