Ability to set lock_path

PROD-34037

Change-Id: I1789298400926ba48273c800d779d5d6fbbe7f0d
diff --git a/oslo_templates/files/queens/oslo/_concurrency.conf b/oslo_templates/files/queens/oslo/_concurrency.conf
index 856ae0d..49c427b 100644
--- a/oslo_templates/files/queens/oslo/_concurrency.conf
+++ b/oslo_templates/files/queens/oslo/_concurrency.conf
@@ -16,3 +16,7 @@
 # tempfile.gettempdir function to find a suitable location. If
 # external locks are used, a lock path must be set. (string value)
 #lock_path = /tmp
+{%- if _data.lock_path is defined %}
+lock_path = {{ _data.lock_path }}
+{%- endif %}
+