[nova] Create yoga branch for client and non-client libs

This creates the stable/yoga branch for all client and non-client
libraries now that we are past the lib freeze on February 24th.

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, March 4th.

Change-Id: Icb14d5af63739ea6d45ab541223fe00ac97a85f2

deliverables/yoga/os-vif.yaml

@@ -16,3 +16,6 @@ releases:
     projects:
       - repo: openstack/os-vif
         hash: 7f9e9b8a74e01f7722691d257fdbeb625621c7b7
+branches:
+  - name: stable/yoga
+    location: 2.7.1

deliverables/yoga/osc-placement.yaml

@@ -11,3 +11,6 @@ releases:
     projects:
       - repo: openstack/osc-placement
         hash: 73e496ff6cde291bb9cd2d42c64cb3b4c7afdf8a
+branches:
+  - name: stable/yoga
+    location: 3.2.0

deliverables/yoga/python-novaclient.yaml

@@ -11,3 +11,6 @@ releases:
     projects:
       - repo: openstack/python-novaclient
         hash: 63d368168c87bc0b9a9b7928b42553c609e46089
+branches:
+  - name: stable/yoga
+    location: 17.7.0