1. Query 'scope=system' and 'system=true' is neccessary when fetching all users
or groups from Keystone.
Without these, users and groups in other domains (non-caller domains),
as well as system-level users, cannot be detected.
2. Query 'scope=system' is neccessary when fetching all project from Keystone.
1. Uname is availbale now in api via adding "uname=true" in query.
So we can use uname in climc which is much more visual and use uid in
web client which avoid time-consuming remote calls that may occur.
2. Previously, the template for the message was managed by the
individual sending components. Now, these templats was managed uniformly
by Notify Service so that we can easily add and remove.
3. Now, failure to send a validation message will trigger a notification
to the user via websocket.
