CHANGELOG for version 0.10

Bug Fixes:

Changes:

- Adjust astakos authenticate to the new url scheme of synnefo >= 0.14 [#3832, #3874]
  as a side effect, some renamings in astakos.AstakosClient:
   info --> user_info, user --> list_users

Features:

- Implement an optional astakosclient cli exposed as "astakos", with the following methods:
    authenticate, uuid, username, quotas, service uuid/username/quotas
- Add some astakos/keystone kamaki-lib api calls [#3874], used to access astakos-calls cache:
  get_services, get_service_details, get_service_endpoints