Fix kube token create with string join error
Fix kube token create with string join error

This patch fix token format error, string join error,
Example:
   token_id = 'ufxq7o'
   token_secret = 'yz7till9p24zb0dj'
   token = '.'.join([token_id, token_secret])
The token value is 'ufxq7o.yz7till9p24zb0dj'

Change-Id: Ia8414037a1291415272b591a9a2e5a7fa5347e41

openstack/senlin,openstack/senlin,stackforge/senlin,openstack/senlin,stackforge/senlin