Release stable branches for bifrost

- Release 5.1.5 for rocky
- Release 6.0.3 for stein
- Release 7.1.1 for train

Change-Id: I314a496c209d12c8a7ba8826e4fba6459bf7fb05

deliverables/rocky/bifrost.yaml

@@ -26,6 +26,10 @@ releases:
       - hash: e63a4c481bbe472fb1d3117995334a899b816e9b
         repo: openstack/bifrost
     version: 5.1.4
+  - projects:
+      - hash: f94b56f015d7bed100199231b40b7583796565d9
+        repo: openstack/bifrost
+    version: 5.1.5
 branches:
   - location: 5.1.0
     name: stable/rocky

deliverables/stein/bifrost.yaml

@@ -22,6 +22,10 @@ releases:
       - hash: 91e3bfad043833f78de1ce5322e78308f0120164
         repo: openstack/bifrost
     version: 6.0.2
+  - projects:
+      - repo: openstack/bifrost
+        hash: 981a0363223e98d188a20d029f008db139db0536
+    version: 6.0.3
 branches:
   - location: 6.0.0
     name: stable/stein

deliverables/train/bifrost.yaml

@@ -18,6 +18,10 @@ releases:
       - hash: 1ec396d8e473587c4d653b6f518bcaa25c819b34
         repo: openstack/bifrost
     version: 7.1.0
+  - projects:
+      - hash: 1de5bb6fa04ad4631b75d950ca978cc7bcbfb4dc
+        repo: openstack/bifrost
+    version: 7.1.1
 branches:
   - location: 7.0.0
     name: stable/train