Glance: add lock_path setting

This is required to use, e.g., Cinder iSCSI backend with Glance.

Closes-Bug: #1959663
Change-Id: I6d5e0e4ab70922a772f3c82e914f9e7d37cf0318
(cherry picked from commit 75305aa)

Author: yoctozepto

ansible/roles/glance/templates/glance-api.conf.j2

@@ -112,6 +112,9 @@ filesystem_store_datadir = /var/lib/glance/staging
 [oslo_middleware]
 enable_proxy_headers_parsing = True
 
+[oslo_concurrency]
+lock_path = /var/lib/glance/tmp
+
 [oslo_messaging_notifications]
 transport_url = {{ notify_transport_url }}
 {% if glance_enabled_notification_topics %}

releasenotes/notes/bug-1959663-afda889b9aa4c63f.yaml

@@ -0,0 +1,6 @@
+---
+fixes:
+  - |
+    Fixes Glance with Cinder iSCSI backend failing due to lack of lock_path
+    setting.
+    `LP#1959663 <https://launchpad.net/bugs/1959663>`__