Add Oslo release(s) for May 1st, 2017

Change-Id: I8abf37548a860a405f30d74f407bfdd0f6034db8

deliverables/pike/oslo.cache.yaml

@@ -18,3 +18,7 @@ releases:
   projects:
   - repo: openstack/oslo.cache
     hash: 4badcee9f022b605228b49b51a5e338185359359
+- version: 1.21.0
+  projects:
+  - repo: openstack/oslo.cache
+    hash: 67c023c0a7fad02608a4db69bf2c12d00cc8f109

deliverables/pike/oslo.config.yaml

@@ -18,3 +18,7 @@ releases:
   projects:
   - repo: openstack/oslo.config
     hash: 4cc7c6cb9bd96c986680241bbf2d3d454bcba246
+- version: 4.1.0
+  projects:
+  - repo: openstack/oslo.config
+    hash: 12fd34b963f6efa1bd8afd8ce06de33c90135f6d

deliverables/pike/oslo.messaging.yaml

@@ -26,3 +26,7 @@ releases:
   projects:
   - repo: openstack/oslo.messaging
     hash: 2461f0b4ed88297ffc00274a4d9b474f231116ba
+- version: 5.23.0
+  projects:
+  - repo: openstack/oslo.messaging
+    hash: 8e5e5ab21874237a0f1048d2f705bc4b1f67631a

deliverables/pike/oslo.service.yaml

@@ -18,3 +18,7 @@ releases:
   projects:
   - repo: openstack/oslo.service
     hash: 3be392497afdd802cbfcb1eb327cef5e6626f8c0
+- version: 1.23.0
+  projects:
+  - repo: openstack/oslo.service
+    hash: 8f67ed7d530770417e462d569ef413a0300c0e66

deliverables/pike/tooz.yaml

@@ -35,3 +35,7 @@ releases:
   projects:
   - repo: openstack/tooz
     hash: 92c83b2b2ef7877bd448329cad5138da7746c8bf
+- version: 1.56.0
+  projects:
+  - repo: openstack/tooz
+    hash: 8ebc10ace80dbffc1f4de0b9716431aa079c450d