Create stable/1.0 branch for Tenks 1.0.x

This will allow us to create releases with Python 2 support, while
moving forward with the Python 2 drop on master.

Change-Id: Ie7a8f36c3b88f5451c44c5a37f1ac3543a942e6e

deliverables/_independent/tenks.yaml

@@ -9,3 +9,6 @@ releases:
       - hash: b783f1c66daeb4a8c2636025c74d17f167d9ca11
         repo: openstack/tenks
     version: 1.0.0
+branches:
+  - location: 1.0.0
+    name: stable/1.0

openstack_releases/cmds/validate.py

@@ -85,6 +85,7 @@ _NO_STABLE_BRANCH_CHECK = set([
     'gnocchi',
     'rally',
     'puppet-pacemaker',  # tracks upstream version
+    'openstack/tenks',
 ])
 
 _TYPE_TO_RELEASE_TYPE = {
@@ -1472,7 +1473,8 @@ def validate_branch_prefixes(deliv, context):
 def validate_stable_branches(deliv, context):
     "Apply the rules for stable branches."
 
-    if deliv.launchpad_id in _NO_STABLE_BRANCH_CHECK:
+    if (deliv.launchpad_id in _NO_STABLE_BRANCH_CHECK or
+            deliv.storyboard_id in _NO_STABLE_BRANCH_CHECK):
         print('rule does not apply to this repo, skipping')
         return