Having a "locked" status for a user

[yncyrydybyl]

As an admin, I like to disable the possibility for a user to use the service but enable the user later again.
By introducing a new status called "locked",
which is not deleting user's data
but prevent user from logging in and
remove him from the address book this would be possible.

There are already 2 MSCs regarding this topic.

• MSC3823: A code for account suspension
  
• MSC3939: Account locking