[cinder] Create zed branch for client and non-client libs

This creates the stable/zed branch for all client and non-client
libraries now that we are past the lib freeze on September 1st.

If the team wants to wait for a specific patch to make it to the
library, someone from the team can -1 the patch to have it held, or
update that patch with a different commit SHA.

Patches with no response will be merged by Friday, September 9th.

Change-Id: I8d20807bfe561cee8c3982df11de3919680ec55c

deliverables/zed/os-brick.yaml

@@ -15,3 +15,6 @@ releases:
     projects:
       - repo: openstack/os-brick
         hash: f5d5371cbc2a2c0267030d19c2b579442a110590
+branches:
+  - name: stable/zed
+    location: 6.1.0

deliverables/zed/python-brick-cinderclient-ext.yaml

@@ -11,3 +11,6 @@ releases:
     projects:
       - repo: openstack/python-brick-cinderclient-ext
         hash: 6a1c4736a6ca6a8dfc66a585b2b418bb9789c327
+branches:
+  - name: stable/zed
+    location: 2.0.0

deliverables/zed/python-cinderclient.yaml

@@ -15,3 +15,6 @@ releases:
     projects:
       - repo: openstack/python-cinderclient
         hash: 730a8c7728a8481d4c74e4c93b2619025f7267ea
+branches:
+  - name: stable/zed
+    location: 9.1.0