Import swift-bench release history

swift-bench was not released since we introduced the releases
repository. In order to stop having it flagged as missing (and
to have it mentioned on releases.o.o), import past release
history in the repository. Future releases (if any) will use
the releases repository.

Change-Id: Idd0b3cfc86d81faa82f381a714566b14894c9384

deliverables/_independent/swift-bench.yaml

@@ -0,0 +1,11 @@
+---
+launchpad: swift
+team: swift
+type: other
+releases:
+  - version: 1.2.0
+    projects:
+      - repo: openstack/swift-bench
+        hash: 24d87611906071fe3fe0914c64bb0fc7e468ce0e
+repository-settings:
+  openstack/swift-bench: {}