Fix the issue of neutron router external gateways unreachable

The configuration item "conf.neutron.DEFAULT.lock_path" is not
used anymore, we need to override
"conf.neutron.oslo_concurrency.lock_path" to
/var/run/neutron/lock

Verified that in neutron-l3-agent-controller-0
and nova-compute-controller-0, not see lots of errors anymore.
Router update finished in neutron.agent.l3.agent

closes-Bug: #1841660

Change-Id: I9c62872d86ba8f92cb8380181bf91389767cba09
Signed-off-by: zhipengl <zhipengs.liu@intel.com>

stx-openstack-helm/stx-openstack-helm/manifests/manifest.yaml

@@ -1400,7 +1400,6 @@ data:
           pnet_audit_enabled: false
           driver: messagingv2
           enable_proxy_headers_parsing: true
-          lock_path: /var/run/neutron/lock
           log_format: '[%(name)s] %(message)s'
           policy_file: /etc/neutron/policy.json
           service_plugins: router,network_segment_range
@@ -1411,6 +1410,8 @@ data:
           # Increase from default of 75 seconds to avoid agents being declared
           # down during controller swacts, reboots, etc...
           agent_down_time: 180
+        oslo_concurrency:
+          lock_path: /var/run/neutron/lock
         agent:
           root_helper: sudo
         vhost: