This adds a new flag, `-admin` for creating admin users, which can
access admin service commands, among which create-user to create other
users on-the-fly.
Since the person running the commands in the README will be the local
soju administrator, the user they create should be admin as well, hence
the README update.
Reading from stdin with Scanner.Scan() can either fail because of a read
error, or return no bytes because the EOF was reached.
This adds support for checking these cases before actually reading the
password.
For Network and Channel, the database only needed to define one Store
operation to create/update a record. However since User is missing an ID
we couldn't have a single StoreUser function like other types. We had
CreateUser and UpdatePassword. As new User fields get added (e.g. the
upcoming Admin flag) this isn't sustainable.
We could have CreateUser and UpdateUser, but this wouldn't be consistent
with other types. Instead, introduce User.Created which indicates
whether the record is already stored in the DB. This can be used in a
new StoreUser function to decide whether we need to UPDATE or INSERT
without relying on SQL constraints and INSERT OR UPDATE.
The ListUsers and GetUser functions set User.Created to true.
