Release tripleo-common 11.4.0 (train)

11.4.0 is a new release which contains a lot of backports, useful for
the TripleO project.

Change-Id: Ib7d84c220f279f4d4db5ff50ffed9a4d550974ca

deliverables/train/tripleo-common.yaml

@@ -31,6 +31,10 @@ releases:
     projects:
       - repo: openstack/tripleo-common
         hash: c653a6f0b46398e0e814cb64e72591963db67e82
+  - version: 11.4.0
+    projects:
+      - repo: openstack/tripleo-common
+        hash: f7715be87ce7314b3bf8db743a85ebd9fa69575d
 branches:
   - location: 11.3.0
     name: stable/train