Release cinderclient 3.1.1

Release from stable/pike.  Contains fix for Bug #1708188.
Note: even though this release includes a global requirements
update, only the patch version is being incremented because a
3.2.0 has already been released for the queens series.

Change-Id: I7d6dc0fd5eab902bb362483690bebf9021344651

deliverables/pike/python-cinderclient.yaml

@@ -30,6 +30,10 @@ releases:
     projects:
       - repo: openstack/python-cinderclient
         hash: 99bb6f3ecb1f3c883c50bf715618e64b145257b2
+  - version: 3.1.1
+    projects:
+      - repo: openstack/python-cinderclient
+        hash: f3dcbd2f77d5f87c2dfa47cabf8aeb1047381031
 branches:
   - name: stable/pike
     location: 3.1.0