identity: don't specify API version in {public,admin}_endpoint

{public,admin}_endpoint parameters are used for service discovery in
Keystone API. They should not contain the API version otherwise that
would lead to an URL like this:
<link href="https://os-ci-vip.ring.enovance.com:5000/v2.0/v2.0/" rel="self"/>
puppet-keystone: update refs

Update the refs to have a fix for {public,admin}_endpoint parameter.
Note: it mays be the last commit before switching to Juno.
Merge pull request #719 from enovance/key-url

identity: don't specify API version in {public,admin}_endpoint