Add namespace to osbs master configuration

Signed-off-by: Clement Verna <cverna@tutanota.com>

playbooks/groups/osbs-cluster.yml

@@ -751,7 +751,8 @@
           builder_use_auth: true,
           distribution_scope: 'private',
           registry_api_versions: 'v2',
-          builder_openshift_url: 'https://{{osbs_url}}'
+          builder_openshift_url: 'https://{{osbs_url}}',
+          namespace: 'osbs-client'
         },
       when: env == "staging"
       }