fix(auth): Define service_type in keystone_authtoken (#411)

* feat: Define service_type in keystone_authtoken

If application credentials with access rules are required,
an OpenStack service using keystonemiddleware to authenticate
with keystone, needs to define service_type in its configuration
file.

Once https://review.opendev.org/c/openstack/openstack-helm/+/883066
is merged, we can revert this PR.

* chore: clean-up yaml configs

---------

Co-authored-by: okozachenko1203 <okozachenko1203@users.noreply.github.com>
Co-authored-by: Mohammed Naser <mnaser@vexxhost.com>
diff --git a/roles/neutron/vars/main.yml b/roles/neutron/vars/main.yml
index cdab428..5dfaca0 100644
--- a/roles/neutron/vars/main.yml
+++ b/roles/neutron/vars/main.yml
@@ -37,6 +37,10 @@
         live_migration_events: true
       oslo_messaging_notifications:
         driver: noop
+      keystone_authtoken:
+        # NOTE(okozachenko1203): We can remove it once the following is merged:
+        #                        https://review.opendev.org/883066
+        service_type: network
       service_providers:
         service_provider: VPN:strongswan:neutron_vpnaas.services.vpn.service_drivers.ipsec.IPsecVPNDriver:default
     dhcp_agent: