Pin fixtures for stables branches

Use the current branch for others fixtures in order to avoid to break tests due
to master changes.

Change-Id: I0ff7cbd7190d1ceb9ebf76e949340e25a177085e

.fixtures.yml

@@ -2,11 +2,15 @@ fixtures:
   repositories:
     "stdlib": "git://github.com/puppetlabs/puppetlabs-stdlib.git"
     "inifile": "git://github.com/puppetlabs/puppetlabs-inifile"
-    "keystone": "git://github.com/stackforge/puppet-keystone.git"
+    "keystone":
+      repo: "git://github.com/stackforge/puppet-keystone.git"
+      ref: "origin/stable/juno"
     "mysql":
       repo: "git://github.com/puppetlabs/puppetlabs-mysql.git"
       ref:  'origin/2.2.x'
-    "nova": "git://github.com/stackforge/puppet-nova.git"
+    "nova":
+      repo: "git://github.com/stackforge/puppet-nova.git"
+      ref: "origin/stable/juno"
     "openstacklib": "git://github.com/stackforge/puppet-openstacklib.git"
     "vswitch": "git://github.com/stackforge/puppet-vswitch"
     'sysctl': 'git://github.com/duritong/puppet-sysctl.git'