Add repo settings and remove highlights for Cactus

We've deprecated per-release highlights and are now removing them.
We also now require repository-settings for deliverables. This adds
the one and removes the other.

Change-Id: If4c1e749cbf1bd56b16891f4558e3187afd66345

deliverables/cactus/glance.yaml

@@ -8,3 +8,5 @@ releases:
     projects:
       - repo: openstack/glance
         hash: 1975f1693380bae370245fbbf1eb6dbd409dcc72
+repository-settings:
+  openstack/glance: {}

deliverables/cactus/nova.yaml

@@ -8,3 +8,5 @@ releases:
     projects:
       - repo: openstack/nova
         hash: 8d304410250ddb33d2b2140456096816e0d62410
+repository-settings:
+  openstack/nova: {}

deliverables/cactus/swift.yaml

@@ -4,7 +4,9 @@ team: swift
 type: service
 release-model: cycle-with-intermediary
 releases:
-  - version: "1.3.0"
+  - version: 1.3.0
     projects:
       - repo: openstack/swift
         hash: 8870fbc4f3f67ff3d9eb15ed8c69768c6dd419d5
+repository-settings:
+  openstack/swift: {}